I installed the DDM Tuning HIDs back in the summer. 35w with 6000k bulbs for lo and hi beam. Very clear color with a slight blue look. As previously stated, I had to install a wiring harness from the battery to the HID system to prevent the hi beam from kicking off when I started the bike. I bought HIDs primarily for daytime visibility...and yes they are noticeable. You'll get scattered light at night, but now I can see the road ahead.
Most, if not all HID kits are made for cars (regardless of them being advertised as motorcycle kits). As such, I had to wrap the fuse assembly on the wiring harness in plastic and tape to ensure the water stayed out. If buying today, I'd probably go with socalmoto gear kit.
You also asked about heat - yes the headlight gets hot, especially on hi beam with two bulbs illuminated, but I've had no negative results, no melted housing, etc. I would definitely do HIDs again.