I have had a Yana Shiki H4 HID installed in my SV1000 for about two years and 20,000 miles. The H4 HID bulb actually consists of a HID bulb for the low-beam and a smaller regular halogen for the high-beam. Up until a month ago it has been awesome, then the HID began having trouble starting and staying lit.
The first thing I noticed when I received this product was that it wasn't identical to the one I got in the kit. The original had a metal base, this one was plastic, and the wires on the original were significantly (6-7") longer than this replacement.
Long story short - I replaced the original bulb with this one, had the same problem, so I drove with the high-beam on for awhile instead. The high beam partially melted the base and burnt out within 50 miles.