I have the eBay HID telescopics with the ultra slim ballasts in my 1st gen and like them a lot. They are mut bueno during the daylight hours at getting the attention on cagers, especially when run on High beam. Since I installed them last winter there have been countless times where a car at an intersection has started to go and then jammed on the brakes when they saw my lights.
The HIDs have an awesome low beam pattern at night. But because the high beam pattern of our headlamp buckets is sub-optimal when in high beam (regardless of whether HID or Halogen), my recomendation is to run with one fixed HID low beam and the other a telescopic. This is easily accomplished by just replacing the left side telescopics with a fixed low beam HID capsule, and leaving the solenoid wires for that side taped back. The fixed low beam helps fill in the foreground whn in High beams and actually gives a better overall pattern.
You can also accomplish the same thing with the two telescopics by switching the headlights to low beam and then unplugging the solenoid wire on the left telescopic. The only probelm with that scheme is that the capsule is not solidly held in that psoition, so it is possible you'd hit a bump or something and knock the unpowered solenoid into the high beam position. That said, I have never had that happen.
I documented the whole shebang starting here:
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YHMV
