Hi lakester, thanks for the reply. Unfortunately, the waters have been muddied even further since my initial post as I've been pointed at the BCN3D Sigma. This looks like a very interesting machine, particularly as I do have a number of projects that are likely to benefit from the dual extruder setup (which appears very neat). Since my post, I've also been considering the UM2+'s lack of USB support. Maybe it's just the way I work, but I do like to be able to follow - and control - the printing from desktop software.