spinerval dvd's? yay or nay?

veronica's answer in another post reminded me i wanted to ask you all all about spinervals!

i LOVE workout videos.. or rather good workout videos! i get up religiously every morning at 5 a.m. so i can workout before i go to to work!

as for riding.. since i live in the desert.. i will be able to, for the most part, ride weekends year round... but once the time changes... i may or may not want to go out and ride after dark... so, site unseen, i'm thinking spinervals.. but i'd like some real biker reviews! i've read about the on video fitness forums and people seem to like them (and there are new ones coming out in the fall!)

also.. if you recommend them... should i buy then in order (1, then 2, etc) or are there some that are better to start with than others.. OR... should i just buy that whole set that i can get at performance?

also.. a side note... hubby has 5 of chris carmichaels tapes.. are spineravals like these? should i actually get on the trainer and try one of these to see what i think? or is there no comparison between the two ("fun" factor, workout, etc)

thanx!