I have a set. Owned them for about two years and they work fine. I did also buy the optional wheel chocks
so the car doesn't decide to roll on it's own. Bought them at Advance Auto Parts. Light and don't take up
alot of room in the garage. $49/Amazon isn't a bad price!

 

Yep I have a set and I am happy with them. You can even drive off of them and they dont break,ask me how I know 74 dodge challenger approved.

 

I have the Race Ramps versions. Have several of their products. The 48" ramps I use for oil changes. I have (4) of their 6" and 12" wheel stands and have the 72" low profile trailer ramps for my enclosed trailer.

 

I got a set and have had zero issues. I should note that I don't have the luxury of a shop, so I've been using them on (fairly) level dirt. No cracking, so I'm happy