My R2R, 7-1/2 IPS are my highest Noise to Signal and yet my best sounding content, everyone picks tape over lp after picking lp over cd here.
But the artists/content is limited to the era when they stopped making pre-recorded tapes, so I rarely play my tapes. 15 IPS is far superior to that, but I purposely stay in the pre-recorded 4 track world which is 7-1/2 IPS.
My friend has two Otari’s, and has acquired a collection of expensive tapes over the last few years.
Just as billstevenson said, my friend’s Led Zeppelin Tape is the best reproduction I ever heard, I thought I was hearing what they heard in the studio when creating the music. Previously unlistenable portions became the coolest stuff I ever heard.
Others, even tape versions of his/my favorite albums, the quality varies, great/darn good/ ok/ not so great, no-where worth the price ......
You need to make friends with others who are totally into it, and can lead you to providers of superior tapes.

