I use it a good bit. It is pretty good, but I had better success with Mobile Hotspot (I had a Verizon Pre+, now on a Pre2 with VZW). I too get pretty hot...and sitting on the touchstone, the phone usually stays at the same charge level...or slightly looses charge over time. If I'm in my car, I sometimes hold the phone up to the air vent to cool it off.
The rest of my post is a bit off topic...but it is related to the use of FreeTether, so I hope that is ok.
Sometimes, when I try to activate the wifi, I get the spinning wheel of doom which won't go away...and so I get no wifi hotspot. Sometimes closing the app and starting it again works...sometimes it takes a reboot. A reboot on my device takes about 7 minutes and change. Climate change is happening before I get my freetether wifi going. This is embarrassing and problematic, as I use my Pre2 as a hotspot to do presentations where I need to access an internet application to demonstrate during the training event. So far, I've managed to work it out...I'm fearful that the day will come when I cannot.
This issue is making me think about switching to another OS. I'm getting pressured by my office to change to something supported, something with a future, something in this decade. There were 3 Pre+ users...now I am the only one left in my office. The other Trainers use Android phones and use Verizon's mobile hotspot. I think they have had no issues. The extra cost won't be an issue since the phone is provided by my office.
I may have no choice but to move. And I tell you, having a real GPS solution with turn by turn directions and ACTUAL MOVING GPS LOCKS would make my life easier.