I would agree, re: rough edges, if we were talking about Ardour 2 or 3, which both missed some important features and weren't as stable as I'd like. But in the last few years, ardour has improved. I do most of my work in it now. Would recommend it to anyone who wants a FLOSS DAW and isn't too dependent on mental models from other audio software.
If anything, LMMS has the rough edges. The interface lacks polish and consistency. There are some awkward things about using it (why do I have to make a blank bar before I copy and paste a bar into it?). And I've noticed some glitchy behavior - for instance, I just made a ZynAddSubFX patch that sounded different as a plugin in LMMS than when I used it in Zyn's own application. Strange behavior like that, but fortunately it's rare.
But all that considered, LMMS is still great, and I appreciate the work it's authors put into it. I don't think of it as a daw; more of a sequencer. But if your music is 100% digital synths and samples, it serves all your needs.
Right now I'm using: LMMS (sequencer), Ardour (daw), JAMin (mastering suite), and Audacity (swiss army knife). I like Reaper. I've used ableton live many times, and I still don't get it - I guess the workflow is optimized for live mixing? I found it less than ideal for recording in a studio.