I'll go on record as saying I rarely buy the new tape ... mainly because no one makes the older, lower output formulas. I don't have a serious problem with the price ... if that's what it costs, then that's what it costs.
The idea of 'supporting the tape manufacturers' is bologna as far as I'm concerned ... as all companies are concerned with their bottom-line, consumers are as well -- I'm going to make the most affordable and logical choice based on my needs. The manufacturers and retailers should cater to the needs of the public, but we often see them creating the needs themselves. I don't currently need new tape just as I don't need a tablet or smartphone to 'stay connected'. I can tell you I have felt like a reel (ha) chump paying $90 to discover it's a sub-par tape when I could have purchased something better for $10-$40. Yeh, it can be a bit of a gamble buying old tape but if you play your cards right, you're never out more than a few bucks, and you usually get a nice metal reel out of the deal at the very least.
My opinion is that that RMGI tape is not up to the standards of Quantegy tape, and certainly not on par with the older 3M formulas ... it is an inferior product. And if I can still get the good stuff for cheaper, I'm going to. The recommendation to 'always use new tape' is like saying 'always buy new guitars' ... it just doesn't work for me. I've never used ATR because it's too hot for my tastes.
If and when the day comes where old tape is too scarce and/or expensive to be practical, then I will re-assess my options ... if the manufacturers of new tape have gone kaput by then, so be it. I won't feel responsible for their demise because I gave them a fair shake and they didn't deliver the goods. For mixdown work, there will likely not be any shortage of Ampex 632-type stuff in our lifetime. Multi-track may be another issue, but I could see baking and re-baking 1" or 2" tape for this purpose if it really came down to it.
I can tell you I've given RMGI tape more than a few chances from 2008-2012, and have always been disappointed with the performance (though it does sound good) ... the rub is that it costs a lot more than NOS tape. Even used tape has been more reliable in my experience (I recorded most of my last album on used [late '60s] reel of 1 inch Scotch 206 [some with splices!] without any problems). I admit that RMGI has been great at addressing problems on a customer service level (including replacing bad reels ... with more less-bad-but-still-not-great reels).
I was not going to post to this thread, but I think it's for the greater good of all tape recordists to speak frankly and honestly. The idea that 'old tape is bad and new tape is good' is simply incorrect.
That said, if RMGI or ATR offer lower-output, classic tape that is more stable at something resembling a slightly more reasonable price ... I will give it a fair shake.
Honestly, if the tape manufacturers are going down, it's probably based on poor performance more than anything else. If the tape doesn't work very well, it kind of defeats the purpose of having it available.