Excellent lights. Well made and still highly collectible. Maybe a little underpowered by todays standards, but still the same functional lights theyve always been.
I had an EDC B42XR which had been modified with a Seoul SemiConductor P4 LED [which boosted the output, whatwith being more efficient than the stock Luxeon]. Quite possibly the best beam pattern I've ever experienced in a light. Nice sized hot-spot [maintaining pretty decent throw] that very gradually and smoothly faded into the spill. [I'm not sure if the beam pattern witht he stock LED is similar]
Even better than the P4 is the XP-G [a cree LED, very efficient, has similar enough light dispersion to the P4 and Luxeon I/III LED's to be able to be fit in, no problems]. There are several threads in the Homemade/Modified sub-forum that detail dissasembly and modification of the HDS EDC/Novatac lights [The former became the basis of the latter], and there are also several members who would modify the lights for a fee.
I haven't been paying much attention the marketplace, but about a year ago, when I sold my B42XR it went for what seemed to be about an average price at that period, ~$130, IIRC. The Ultimate/60/85 models go for a bit more.
And another thing, not sure if you ever read of this... But the HDS EDC series [if a "Basic" model] could be programmed just like the "Ultimate" models, by using the programmed in "back-door". Clicking it on 250 times [instead of the 10, IIRC for the Ultimate series], switched over the firmware to the "Ultimate" series programming. By which I mean the 250 click easter-egg was a one-time deal [if my understanding is correct].