I had one and sold it. It's a great little light mine was ordered from DX and it said Q5 but when I got it mine was an XPG R5. Mine had the same pill and modable driver as the R5-A3. If you have the nerve to open it up you can switch it to a 3 mode low,medium, high.
I don't recall mine getting very hot maybe a tail cap measurement can provide some more incite into what's going on.
Also the pill fits in a stainless Ultrafire C-3 which is were mine now resides.