Could potentially be added to this. I am sure at some point there will be a derivative. 

Just to put this in perspective I have been in possession of a RepRap style printer for the last 2 yrs. As I got a TechZone kit, which was a huge mistake, one of those years was spent learning how bad that kit was. I then bailed and bought all the parts for a prusa mendel, which relative to the kit, was an absolute dream to work with. 

I used it up until about 4 months ago, I had to print a series of kit shells for a robot workshop I was running. It did a valiant job in churning out a heap of parts. It ran 24hrs a day for pretty much 4 weeks, with my various revisions and then 15 lots of the finalised parts.

Unfortunately by the end of this, it was pretty broken. I had printed all the bits out of ABS for better mechanical properties and this higher tempt took its toll on my printed parts. At the end I had to call on a friend to print the last few parts for the robots. My heated bed was screwed, my hot end crapped out and I had all sorts of issues with my belts and motors. 

At this point I spent a few months trying to revive it. New belts, new pulleys, new bed... ect. But it was never the same. So I bought an UP!. Mini. 

First thing I should mention. The UP Mini still has QA issues. (If I could put this in bold.) 

However, my issues consisted of the bed not being level and my extruder having some filament stuck in it. The levelling was fixed (mostly) by adding a washer. And the extruder was removed with two bolts and the excess filament removed. 

Don't get me wrong I was more than a little pissed when I got it out of the box, fired it up and it didn't work. But I have to give credit to Bruce at 3Dprintingsystems for his support and assistance. 

And let me say printing with the UP is very different to printing with a reprap. Once I had resolved my initial issues that was pretty much it. You make model print and then the part exists. Oh and let me just say the support structure to hold up overhangs and what no is simply amazing. NFI how it does it so well. 
Some dude is ranting about how the mini clips are a failure point. http://www.thingiverse.com/thi... and while he is in spain and appears to have run into issues with his local supplier I don't think this is worth putting you off buying an Up Mini!.  These clips may break in shipping but I see no reason why they would ever break once your machine is running. Angus (vvvv below ) received his mini with a broken clip but got it replaced. And its now working fine after he was sent a replacement by his reseller. 

So in summary I view the UP! Mini as a tool. Its filament costs a bit more and it costs more up front. But (for the most part) it just works. I draw parts and I get them. My RepRap I spent 80% of my time trying to get the best parts I could. Rather than actually worrying about what I wanted to print. I am not saying it wasn't fun. Or a great learning experience. Just not what I wanted anymore. I need parts for stuff I want to make. Sort of over trying to work on my own printer. 

Anyway long rant but hope its helpful.Steve

Hope its working. :)