Wow, I guess I've been extremely fortunate. All the ones I've used (at least 20, probably 30) have been just fine and dandy... all but one little lonessome fella that was DOA.
Sometimes they line up pretty good, like the one poster mentioned, with just a 1/4 turn off snug.
Other times, it's just off enuff that it's fun teaching this old dog new tricks. Wow, I can actually use this without it having to line up perfectly afterall. Same with the USB eGo, I am now a thumb pusher as well. Never thought this day would happen, but it has. It's nice not having to be such a finicky perfectionist anymore. (sure took me long enough tho)
As far as them coming apart, I've never ever had one fall apart in any way shape or form. Is that odd for me, or is it odd for you? So far, so good, for me. I get mine at Rob's, at goodprophets.com
You might want to email the places you bought yours from and let them know how awful their batches are. They can't do anything about it, if they don't know anything about it. Hopefully it was just those two batches ... and hopefully the vendors can ship them back to the factory and get replacements.