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Best guitar amps/cabs/effects app(s)?
I did some research, and I originally had been interested in Amplitube. However, according to quite a few reviews in the app store, it appears this app is one of the worst IAP offenders and the app is unstable with lower sound quality. Does anyone own this app and can tell me if those reviews are too harsh, or right on, or untrue? Are there alternative guitar amps/cabs/effects apps out there that are as good or better? Thank you again for the help, and early Happy New Year. 
Comments
There are a lot of threads here on the subject for your searching pleasure. Try searching for amplitube, jamup and bias to start. There are others! I'm pretty sure almost all of them have 'free' versions where you can try out a couple of the pedals/amps and decide for yourself.
Fan of AmpKit / JamUp / Bias
I love Ampkit. I really like their MesaBoogie Dual Rectifier sim, I think its called Tread Plate, and I think the Trace Elliot 1215 is the best best bass amp on iOS, see what you have done now, I'm gonna have to do a video on those two lol. I also get the cleanest sound from AmpKit.
Ampkit has had an interesting update recently.
I think BIAS is the best amp sim by a long way, but both Amplitube and Jamup are also pretty good.
BIAS is great, allowing you to build your own amp from different components. It also comes with 36 amps included, from clean to extremely overdriven, and user-designed amps are available from a sharing facility. Has bass amps too, but no effects or stomps.
You can export BIAS amps into Jamup, for use with Jamup stomps and effects.
Otherwise, Jamup, Amplitube and Ampkit are all on the same level, I think (have used them all). Some amps or effects will be better in one, other amps or effects better in one of the others. They all have IAPs.
All seem to be on sale at the moment.
Edit: there are free versions of each, too (except BIAS). They are more limited in the choice of amps and effects, of course, but may help in deciding which might be best for you.
I AB'd JamUpPro and Bias against my Blackstar 5w and effects board the other day and was pretty impressed with the apps, although I'd still say the hardware had a warmer sound. I hope to do the same with AmpKit later today.
I have and use Bias and JamUp Pro XT and recently AmpliTube Fender. Bias is great as a sound builder and has a lot of great amps, but no effects. For that you could use JamUp. Bias and JamUp work great together, not cheap but are now on sale. JamUp can work as a money drainer cause it has a lot of in app purchases.
Lately I bought and use AmpliTube Fender, its more simple, and has great sounds.
You can also use the app Master FX, it is great for tweaking sounds, I use it and like it. You can put it in the effects and output slot of Audiobus.
I also have Mobile Pod which is also a very good guitar app and comes for free when you buy Sonic Port from Line 6 (a very good interface between guitar and iPad). The full app for free, including all sorts of amps and effects, and it has a great preset system.
Honestly, as stand-alone, I think JamUp has the best tone with better/ less digital processing, especially of higher pitches, but if you have Auria than convolution reverb with cab IRs are the way to go and any amp simulator with a decent noise gate sounds great. Derek Buddemeyer showed some of the more subtle differences, but there are lots of great extremes that can be done with this. If Jasuto gets convolution or if Sampler Space ever gets on the bus you could do this method in Audiobus.
I think Bias is the best amp simulator and it doesn't have any IAP to bug you about.
Mobile POD is excellent. I do wish it had MIDI control though.
I find that I use JamUp and BIAS the most, although I have them all. Just buy the effects you want and you are good to go.
As far as tone goes, Bias is the best by far. Jamup is 2nd best IMO but not hugely different in quality to AmpKit etc.
Bias is however very CPU hungry and has no effects.
I haven't used Bias on a track yet, but you can hear some JamUp on this one.
Or ..more rock sounds
I like Ampkit but I have to say that when I compare its Peavey Classic to my real Classic 30 I'm put off digital sims for a long while. Just can't get that feel the amp in my fingers sensation.
Bias integrates with jamup so any amps made with bias are usable from with jamup along with effects and all.
I think starting with Bias it is!
I don't necessarily need effects at this point in time, and I'll probably wait to purchase Jamup XT next time it's on sale.
Jamup Free has a couple of effects for nothin' and works hand-in-hand with Bias. If you're good at resisting IAPs, you can get a lot of mileage out of the Jamup Free version paired with Bias for zero extra cost.
What @wim says.
Buy BIAS. Get JamUp Free. Buy fx bundle. Every Amp in the pro version (and lots more) is in BIAS already.