We've both said this about each other before - we're on the same journey, just on separate paths.
So you're scoping out an HID.... nice. I finally did it a couple of months ago, after months of poo-pooing them, and weeks of anguish and public humiliation as I wrestled with the decision.
In Summary:
* HID-Lite (Light Cannon) came first. A fine light - but quite bulky, expensive to operate (all those cells to schlep around) fragile, heavy, and never around when I really wanted it because it wasn't integrated into the kit. I wasn't wearing it, so I constantly left it behind. Very limited in its usage - it has a wide throw, not good for daytime signaling or communication. Cool entry level light, but not a viable long term solution for me.
* The overrated Scout light came next. I was using a Tec40 (which I use now as a 3rd in the pocket) and thought I'd drink a little more kool-aid and check out the Scout. Got a great deal on ebay, picked one up...underwhelmed. Solid, reliable, just no biggie.
* Lastly - the Halcyon HID10. Great ebay deal (off-set another $140 by selling my light cannon on eBay that same week.) Laser-like adjustable beam, small, light weight, and always with me as its part of the rig. Not always in use, but always with me. I can't believe how fast it charges and how long it lasts. I don't even bring the charger unless I'm on a 2 day boat.
I spent months here cracking on the zillion dollar HID's as some kind of pretentious luxury. What finally pushed me over was the communication aspect of it - the whole keeping track of your buddy (and vice versa) throughout the dive. Its a great thing to work in tandem, just crusing along, seeing the beams and communicating throughout the dive that way.
I'm still pretty new to team diving and formation diving, but I'm totally into it and the assurance it delivers - beats the heck out the constant spinning to keep in visual with your buddy thing.
It was a stretch, and they are quite expensive even on a good day (my exposure suit is about the only thing even in the ball park) but I've not regretted it for a moment and now consider it an essential piece of safety equipment I would never dive without.
Enjoy the journey.
K