First off, saying something like "I [..] think I have pretty good ears" is a ridiculous statement. The only way to know is to get your hearing checked. Hearing is not binary (as in hearing vs deaf), and you can easily loose a large spectrum of your hearing before you actually realize it. Also, I agree with most of the other posts here. Not ripping to FLAC or WAV is just plain idiotic. The cost of the space is nothing compared to the time it would take to re-rip everything. In 5, 10 or 20 years, a few 100G will be the sample space on Google drive or equal to what you carry around on your credit card. Considering the cost and time to rip (not to mention the limited shelf life of physical media), its not worth the risk for literally zero gain.