"Have you (or anyone here) made this kind of return with AIM? I.e. >= 12% over a time frame of 10+ years."
I haven't been a long-term AIMer (only about 3 years) and I don't use AIM By the Book -- I use a modified version of AIM. So I can't comment on real world actual long-term results.
However I've averaged significantly more than 12% per year over the past 3 years (although much of that has come in the past year, but then that's the reward for buying all those relatively cheap shares when the prices were down).
On the other hand, I've run so many backtests in AIM that I'm quite confident of AIM's long-term probable results. If I didn't think AIM would be able to return significantly more than 12% per year, I'd simply invest in a good small-cap index fund.
"I would very much like to have the board's consensus on this."
Yes, this would be interesting to see. There are a number of people who have been investing with AIM far longer than I have, and I too would be interested in seeing their real world results.
"(Though I must also add that my LD-AIM silver stocks have probably made about 25-30% in the last two months)."
Congratulations! So you are somewhat diversified after all