I've got a digital subscription to Bike mag. It was $12 for a year and seemed worth while to try it out. I'd never buy the actual magazine, but for that price its brilliant to read whilst on the train/plane when I've got a spare 30 minutes.
The reading takes a little while to get used to, but its actually quite OK once you get used to it. Note that Bike have their own digital reader and not PDF.
I'm seriously considering getting the digital version of ST so that I can read the back copies, and because then I can justify buying The Ride and Rouleur 😉