I sold self funded plans (with spec and agg) exclusively for 15 years. Some groups as small as 25 lives, most were in the 80 - 150 life range.
If you know what you are doing you won't have problems.
I fully agree. It is much easier now since small group reform ushered in GI in the under-50 markets. I am not saying that all smaller/mid-size groups should adopt self-funding, but when structured correctly and when the owners/HR people understand it, there should not be too many problems.