I've had mine for a while & still use it nearly every day. If you want TC via DNA then it can't be beat. I don't MTL but the Maze is not a bad DL atty. The only downside with the Inbox is single battery so unless MTLing battery life isn't great. The MTLers will be along to recommend good RDA's.
I'm using my Inbox right now, with a Narda. It'll give you a decent MTL when closed down a bit, although I have mine full open for a restricted DTL.
I have another Inbox on the showboat, I'd say it's between this and a Pico Squezze for my most used mod.