Reading issues and series I always wanted but never had the chance to read is my favorite thing about the MU app. The alternative would be to buy TPBs (this can get crazy expensive) or risk exposing your phone/computer to viruses and such by going to sites with free scans. Admittedly, I recently did the latter to hunt down the original X:Men: Forever by Fabian Nicieza, which, oddly, is not available on MU. Thankfully, I incurred no damages and it was well worth the trouble.
Another thing I love about the MU app is discovering things I never knew about or would have bothered reading. I recently read the original New Mutants spin-off, Fallen Angels (1987), and was completely engrossed. I've ended up discovering so many oddities that I now consider favorites. It's great.
Chiiile... How do you read comics, then?
Agreed. I sold my collection and stopped collecting comics years ago. I hate clutter. The app is perfect for the type of comic book reader that I am.