I have been enjoying free profiles that do everything I need with minimal tweaking, primarily because they sound good and secondarily because I'm a lazy bastard.
Although I disagree with his overuse of reverbs and compressors, the basic amp tone and feel of Michael Britt's profiles are spot on to my ears, particularly for live use. I know his profile "style" gets slagged as being "too dull" and "doesn't cut through a mix" (FWIW I HATE that !@#$%^& cliche!

You FIT in a mix, not scream your way through it). But those criticisms say more about the critic than Mr. Britt's talents. I would say the majority of those who dislike the Britt profiles for those reasons are either metal heads, bedroom wankers or a combination of the two.
I am also liking what I hear from the Amp Factory and Bert Meulendijk and have started to experiment with some of theirs. They know what vintage amps can do.
Until I profile my amp collection (again, that lazy thing

) here are the main profiles that I have been using live and at home:
MB - Car Slant 6V - I like this for the clean tones. It sounds like a Vox meets Fender Tweed to me.
2011 More Gain AC20 - This sounds like a compressed version of my 64 AC30. It is one of the more convincing vintage Vox profiles I have found.
MB -70 Mars SL 3 - This is my primary rock rhythm profile. I spice it up a bit by using an expression pedal to morph the gain. This particular profile works best with my PRS that is now my primary guitar. I have found better ones for my LPs and Strats that I am currently experimenting with. One thing I would like to add here that I have been meaning to make a thread about, profiles are VERY sensitive to what guitars you plug into them. A dog through your tube amp may turn into a star with the right profile.
MB - Dumb ODS FB3 - This is one profile that I don't think Britt really captured the essence of the amp. The real amp is looser, particularly in the low mids. Listen to Robben Ford and you will immediately hear what I am talking about. That being said, the tightness of this profile makes for an excellent lead tone, which is exactly what I use it for.
MB - Fux FH50 OD 2 Bst - I use this for those over the top leads and the random Santana tunes that we may do. It is a bit hissy and very compressed but, it works well with the Bare Knuckle Abraxis pups in my PRS. I may have found a replacement for this profile with the next one.
There is a poster on the Kemper Forum who made some profiles of his Boogie Mark III Blue Stripe. I have the same amp so I was curious to hear how he did, so I tried them. They do capture the tone and feel of the amp but they sound a bit bright to me. After tweaking though, I may start using his TMS2MK3 MGB DRV2 a bit more in place of the Fux above.
TAF - High Watt JTCran - I tweaked this a touch and added a treble booster. Plug in your P90 equipped Gibby and tell me who it sounds like. You will know.
Finally, the latest profile that gives me a tingle up my leg is a profile Michael Britt put up on the Kemper Forum for someone wanting to cop a Lynyrd Skynyrd Ed King tone. Sweet baby jesus of the cathode ray tube if that profile does not produce one of the finest Strat tones I have ever heard! A couple of my vintage gear collector buddies heard it and swore it was a tube amp from my collection. They just could not believe that some silicone chips were laying it down like that. And it kills with P90s and Teles and with a Les Paul and a bit of tweaking, your in Bloomfield territory.
Kabong and I have discussed pickups before and he tends to hear them the same way I do, so perhaps he will like these profiles. But again, these profiles fit my ear and my needs and how I run my powered Kemper into my conventional guitar cabinets. Your circumstances may vary and you may think my choices are crap, but the great thing about Kemper, much like South Beach on a Saturday night, there's always another one to turn you on.

