I just bought three new generation MacBook Airs (two 11" and one 13") with the faster processors. I tried to revert to OS 10.6 based on what i read here and elsewhere, so I could use Macspeech Medical with the 1.5 engine. I could not load Snow Leopard due to the processor scheme. BUT!!! I was pleasantly surprised that when I loaded Macspeech Medical on the new MacBook Airs, the program works flawlessly. I do not use voice commands all that much, just voice to text dictation for my EMR. We work in a Citrix environment and the program works fabulously on the new machines. My doctors love it.
I must agree they have no customer service, it is the worst I have ever encountered, nonexistent. That being said, I am happy about the usefulness of the program.
Those having problems, you may want to invest in a new laptop as the performance is much faster than the older generation. Just a thought. You know your time is worth something as is all the frustration. Good luck.