I've gotten thousands of euro of 'free' Amazon cloud credits over the years, and would love to have used tried it out for cloud computing/GPU stuff, but the opa

I've gotten thousands of euro of 'free' Amazon cloud credits over the years, and would love to have used tried it out for cloud computing/GPU stuff, but the opaqueness of pricing means I won't touch it (except for S3 backups) - I just don't trust myself enough to not mess up.