I bought a rigidBot because it has a nice 10x10x10 build area and was on sale for $580 shipped.
if I were to do it again I would have bought the basic kit, for $300 (which excludes the hot end and the electronics) and then bought an E3D V6 hot-end, Meanwell power supply and a RAMPs or Smoothie board. I haven't had any problems yet but I've read a lot of people that have had issues with the power supply and hot end and control board. I'm already looking at these upgrades just for the added functionality and reliability.
It's a A LOT of work to get these things up and running though. Took about 5 hours just to piece together the kit and then a whole weekend to figure out all of the software and get the thing calibrated. and even after all that there are still areas where I could make some huge improvements just in the setup but I haven't yet figured everything out... there's LOTS to learn.