My wife's business uses UPS for everthing, and generally they haven't been bad. For little stuff like most RC items, they're slow compared to USPS Priority which is my preference.

I bought used Inferno GT that was shipped UPS. It came crushed and I bet the owner is still trying to get the insurance from them. You absolutely have to pack stuff going UPS very well or it will arrive damaged - if its of any size.

Here when its hot, the stuff arrives at 'closed car in the sun temps' - literally. I've had tools that were almost too hot to handle.