I am quite happy with the results i have gotten from this unit.  It seems that many people have had issues with the heat button no turning off, mine does not have this problem.  It functions as advertised.  So far i have used it to clean jewelry and nitro RC car parts.  It makes gems really sparkle, and gets precious metals quite clean.  It does a very good job of getting engine parts much more thoroughly clean than any other method, including a solvent tank, since you can't get into the internal area's with a brush.  I would definitely recommend this product to any RC hobbyist.