Good mouse at a very good price. I have one of these, and it works well for games and general productivity. I use my G502 as my "go to" mouse, and this has a similar feel and equivalent tracking (as far as I can tell). I just like the extra buttons on the G502.
The build quality is good, it has RGB lighting and software programmability, the performance is great, the price is very good (Typically $50+). One of the better Massdrop offerings.
There might be comparable mice in the sub $30 price range (Nixeus, G203 mentioned here), but there isn't a "better" mouse for $30. The Nixeus is lighter and feels a little "cheaper/plastic-y" but has no software programmability for buttons or DPI and no RGB. The Nixeus is a very good mouse with the PW3360 sensor. For me, I don't care about the RGB that much, but non-programmability is a non-starter.
The G203 uses the mercury sensor. Logitech's version of the G203 with the Pixart 3366 (equivalent sensor to this drop's mouse) is the G pro, which sells for $60+ or so. However, I believe most gamers (myself included) cannot tell the difference between the G203 mercury sensor and the G Pro sensor (or the 3360 in this mouse); but for what it is worth $$ wise, this Siege mouse has the best sensor available right now. The G203 has no RGB (it does have some lighting), and great software programmability.
Some might prefer the G203, or the Nixeus, or whatever for $30. It is all a matter of preference to brand, mouse feel, weight, etc... The very bottom line - if you're looking for a new or "upgrade" mouse, this is a great mouse that hits all the buttons (see what I did there?) of performance, feel, and functionality at a great price. The last thing I need is another mouse, but I'm considering it at this price.