they look ok, but i've bought cheap stuff before only to be disappointed later on. consider it this way. how much use will you get for your 40 bucks? 2 weeks before they start to fall apart. vs 20 weeks for a $100 pair.... they cost per use is much better with the more expensive brands, they spend alot more money on R&D to develop better quality products thats why they cost more.
but as i said they look decent so its your call bro.