I have a similar one, and a previous version to this one:
http://www.gearbest.com/3d-printers-3d-printer-kits/pp_366034.html?vip=768786&gclid=CPPY3YzVztMCFdyLswodNoUEXQ
Its worked well, i did print a stratux case with it with no calibration.
For the humidity issue, i bought a rubbermaid...