Aside from the quality of the profiles (which to me they actually sound pretty good) there is a
difference between sounding "good" and sounding "like the amp".
The TSE and LePou plugins are really nice but they don't
exactly emulate the amp in question. Good Kemper profiles on the other hand, sound almost exactly like the amp under mic.
I just got a KPA last weekend and I am amazed at the sounds I can get out of it. Even with the crappiest profiles I can get
pretty nice tones by messing around with the high or low pitch under the cabinet prefs. Really embarrasses my 11R.