I use TTS extensively, and there are some audio apps that I use that are perfect for quick trouble shooting (now being done by a break out cable on my iPhone).
It a good device. Oddly, it is easier to stay focused with it. It's durable and at this point, if it dies, I would not be as horrified as I would if my laptop did. Upgrading my software licences on my Mac is cost prohibitive, while on the iOS platform it's virtually free.
That all said- iOS devices seem to age poorly. Safari and some other apps seem to get more crash prone with every iteration of iOS. To counter that, I am only frustrated by Safari, and not the apps that use WebKit, and except for some games, nothing that I use regularly crashes.
Post Script: Bitters don't store for ever. Use them if you got them.