[voltagex_]

C4 spot instances work for me at the moment. The price increase for C5 wasn't worth it as I was only seeing a 5-10% performance increase. I need to re-benchmark though.

[Johnny555]

The price increase for C5 wasn't worth

I don't know about spot pricing, but on demand pricing for c5's is about 15% less than the c4's.

If you look at c5d's with ephemeral storage they are still a bit cheaper than c4's.