Are there any alternatives?

No, outside of the Aorus FI32U and Asus ROG Swift PG32UQ, which are both $200 more expensive. Many 4K high refresh rate gaming displays are stuck at 27 inches, including the Eve Spectrum 4K and LG 27GN950. But you can get higher brightness and better HDR performance if you sacrifice screen size.

　　

How long will it last?

Considering how demanding 4K still is for modern PC hardware, the M32U will last the next several years. Until 8K becomes the norm or midrange GPUs can hit high frame rates at 4K, the M32U will hold up. HDR throws a wrench in that, however, so you may need to upgrade in a few years if you want to take advantage of HDR in games.

　　

Should I buy it?

If you need a 32-inch 4K gaming monitor, yes. The Gigabyte M32U is in a class of its own by default. However, you can get a better 27-inch 4K monitor for the same price, which is what I’d recommend for most people.