how often are you gonna change the lenses? if you primarily use it for grinding buy the Uvex and be done with it. if you want the dark lens, wear a pair of quality sunglasses. our shop safety regulation says "wearing safety glasses at all time in the shop even with full face shield.
if you weld with it, by all means get a real welding hood, Miller, Speedglas, Jackson. not a toy.
I used to have a pair of super doper Peltor tactical goggles. the reason I bought it was because it came with 3 sets of lenses: dark, clear, yellow. well, how many times I have changed the lenses? none, before I sold them. the idea sounds good but not practical.
if you are buying it because it looks cool, well, it's your money.