I really like this mouse overall but there's a couple things that might be deal-breakers for some people:
1.) The mouse is pretty small. Definitely check the size to make sure you're okay with it as people with larger hands may have some trouble with ergonomics. I personally find it quite comfortable and my hands are average-sized, but I also had to lightly adjust my grip for it to feel right. I didn't mind this change but some folks might.
2.) Bluetooth on it appears to be spotty at-best. I'm strictly a wired user anyway, so this isn't a deal breaker for me, but be aware that you may run into issues if you plan on using Bluetooth a lot.
So, what's there to like about this thing? Well, quite a bit, in my mind.
For one, the keycap-like shape of the buttons and excellent click feedback are huge plusses to this mouse. It feels like a piece of equipment specifically designed for hobbyists.
I've personally found the side thumb rest to be quite comfortable and an unexpected favorite feature of the design.
I also really like the large scroll wheel and enjoy the weight of scrolling. I know some folks might not like that, but I prefer scrolling to feel less free-form and more like a deliberate action.
Beyond that, the two buttons and face plate can both be taken off, making cleaning much simpler and easier than most standard mice. If it lasts for half as long as my past mice, I'd consider this to be a huge selling point.
I only have one downside with this mouse, and I haven't seen it listed anywhere else in the reviews: I find that my thumb rests directly on the back/forward buttons. These buttons take a decent amount of pressure to activate, and I haven't accidentally pressed them yet, but I feel that this is a question of "when" it will happen, and not "if". Again, I haven't seen this listed elsewhere, so I'm not sure if this is a problem with me or a problem others have had.
Finally, we come down to the overall package. Is it worth the price? I think that's up to you. For a lot of the small conveniences that I've found within this mouse, I think it's worth the price point for me, personally, but I also get the feeling that I'm in the minority here. If you like free-scrolling, aren't sure about the size, or want to use it Bluetooth, I don't think you should bother. If you want to use it as a wired general desktop mouse and don't mind spending a bit extra for the feel, unique look, and quirks it comes with, I think it's a worthwhile purchase.
Rating 5 stars. Would rate 4.5 if it were an option.

Touch PBT Wireless Mouse

The mouse has excellent aesthetics and works extremely well, but is honestly a lot smaller than I was expecting

I mostly use this mouse for design work on the computer, not for gaming or anything else fast-paced and precise, but it works really well! Battery life is very long, sensitivity is fine, the mouse is comfortable to hold (though I have small hands), and the buttons click just like any other mouse despite looking like keyboard keys.
I can imagine the auto-sleep would be an issue for games, if you were startled by something and needed to quickly use your mouse after it had fallen asleep you'd be in trouble, but it really doesn't go to sleep that fast, so unless you had gone AFK it shouldn't sleep on you.
Also I saw some people complaining about the clicky scroll wheel. These people are wrong, it is better than a smooth scroll wheel. If you need precision scrolling there are a myriad of tools that you can install to modify scroll speed (heck, you can probably do it directly in your computer settings).
Overall, I like this mouse! It works for me!

The style and look are amazing.
The mouse is nice to the touch, although not as comfortable as an ergonomic.
Its biggest drawback is that the important "Source" button, to switch between Bluetooth, dongle, etc. is hidden on the lower side of the mouse, while the useless DPI button (the orange one) is taking that valuable space in the upper side.
It wouldn't hurt if the mouse was a little bigger.