When installing my z-temp and zt-he, I did a print (one of the models that came on the SD card) between every component installed. The results all look virtually identical
http://www.z-temp.co/forum/index.php?topic=37.0Almost 1 year later and I'm still very happy with it and just received the z-mon and z-sense to install over the weekend.
The only issues I have found thus far(which is not really related to the z-temp itself, but playing around with various settings could minimize it):
-Using ABS and then changing filament, a bit always gets stuck in the extruder(it's crushed/melted too thick to be pulled through the small top hole), I have to open it up and cut the last bit off before inserting the new filament. Prints with the ABS are still great
-Using PLA on something with a flat base(a plastic cap for chair feet) results in the raft being almost impossible to remove(Though I did give up before breaking the piece) - obvious solution is to print raftless, but playing around with temperature settings is also likely to help
Both of these filaments are from a really cheap local brand and results are likely to vary with others