STD must have changed over the years. I've always found them very helpful and I've heard positive things from other users on these forums. As many will know, I took issue with STD about their focus on emulated solutions in an article about their A6, but the A6 users I've spoken to seem happy enough. Martin's review of the A6 concluded the same opinion.
In fact, I don't think I've had an unresolvable problem with any of the remaining RISC OS companies; the market's too small for bad service to go unnoticed.