I checked their site now (thanks, LAGinz!) and they seem to offer some Big Tick Audio of yore for free (Cheeze Machine & Ticky Clav).
Edith: you stay outta there.
I had all three, but kept Computer Music, primarily for its easy look and the monthly bonus. MusicTech and FutureMusic have better reviews, but for those I prefer Sound on Sound.
TLDR: Computer Music for fast and fun and Sound on Sound for serious stuff.