I figure a review should be written after the product has been used properly over time, not just in the first flush of geek-love after the box has been opened.
I've bought a decent spec PC and decided it was time to treat myself to a decent mouse after years of using cheap and rubbish ones. I've got quite big hands, and I suffer from RSI quite a bit, so I thought very carefully about the one I went for.
The first one I went for was a Habu, a reasonable mouse which was made with Razer bits with Microsoft, thinking it would avoid a lot of compatibility issues. I loved the razer parts of it, and disliked the MS bits, and so took the plunge and went for a Lachesis pretty soon afterwards.
It's a fantastic piece of kit - I've run it hard for three years now and it's the only mouse I've ever had which I have a relaxed and comfortable posture on - it takes a bit of getting used to, but I don't grip the mouse hard, and I've not had RSI since I've started using it.
Indeed, I'm considering getting one for my PC at work.
The cable is a little light, and is worth protecting, but this just means not tugging it out of a laptop bag by the thing. Thhe casing is rubberised, and has lasted extremely well - there is no wear visible. With two minutes and a cleaning wipe, it genuinely looks brand new still.
Another review says that they experienced freezing and the like - this DOES happen if you press the buttons on the side and have not configured them correctly - it's part of the programming - so ignore that, and just make sure you take the 3 minutes or so to configure the thing correctly and you'll have no problems after that.
Your mouse and keyboard are in use constantly when you work on a PC - this just makes the process that bit more precise, that bit more comfortable, that bit less trying. There is a new iteration of the Lachesis out, with a 5600dpi option - so you might find one of the extremely good first gens at a decent price. If i get one of the new ones, I'll drop you another review, probably in a couple of years :)