I bought a few of these to try out. I've used a lot of old stock tapes and use these for calibration and pleasure.
My only real problem with the new cassette, is with the shell. Sometimes the small pulleys at the bottom of the shell do not rotate or get a little stuck which can cause some problems with accurate playback.
Having said that, I haven't heard a problem on recording and playback. The sound quality is brilliant with an excellent high end response. I'd highly recommend trying one. Chrome tapes are currently not available new, however this new Ferric tape, I believe, can match them in the high end while still giving powerful bass. Channel balance is near identical.
Overall, I'm impressed with this new tape and relieved to know that a quality tape is now being manufactured today. Sometimes, you just need a brand new tape that you know is going to work well.
Looking forward to the 90 Minute version!