There isn't really any downside, of you are running with no alternator or you run fans etc with the engine off you should get a deep cycle. The only downside is the cranking amps are usually a little less but most people have way more of that than they need. If you have to have two batteries or 1000CCA to start your junk you have other problems, I don't care what your compression is lol.

I like the Optima products, despite what a lot of people say about them they are great batteries. I just replaced a ten year old yellow top in my race car and a 7 year old redtop in my Jeep. The yellow was still working but was starting to gas when charging, and the red top just died from lack of use.

The yellow top has deep cycle capability and is still 750CCA so its a good choice for any race car really.