I got my LED kit about a week ago in the mail. I've been using it at work all this week.
The colour of the light emitted is much more desirable than the original bulb. At first glance it certainly looks blue-white, but you can see objects of all colours easily. Distinguishing a black cap screw from a dark brown raw casting from 1m (deep inside a dark die) is really easy with this colour of light, much easier than the original bulb.
Installation is easy. The included reflector replacement takes no time to switch, and the bulb is more simple to install than the original has it has the drive circuitry make it easier to hold on to.
It's true that the LED kit doesn't allow as tight a focus as the original bulb. I find this doesn't really matter at all. The weak light coming from the original makes a tight focus a requirement. The LED's brightness more than makes up for the lack of focus. I find myself not being nearly as concerned about the focus of the tool with the new bulb as the old, it's just so bright. I just turn it on (it starts at the most focused position) and go. Really convenient.
Obviously the only drawback is the price. After shipping and taxes, it cost me about $50 Cnd. Worth it in my opinion as I use it every day for work, and am useless without. I don't think I'm going to replace the bulb at home, however. I just don't use it enough.
Sorry for the rambling nature of this review. Always something else to do.
Regards,
Robin