I've used many FMS products including Total Access Analyzer for years and they've been very reliable (I have their suite). I got the 2010 version a few months ago and it's working really nicely for me. Can't imagine developing Access apps without the analysis it performs to catch stupid errors and improve my skills.
That said, I don't know what bugs you've encountered. Was it failing with the 2007 version? FMS has improved their products with each version over the years, so I presume if they said they fixed something, I'd take their word for it. They have a money back guarantee so I presume you can get a refund if you're not happy.