I bet if you remove the flashing, the GL would fly like a new Opto Stag. I liked, but didn't LOVE, the Stag..same feeling I get with the Saint Pro. They have crazy glide, but I'm old and set in my Teebirdish ways.
I haven't thrown a regular Opto Saint Pro, but the Moonshine I tested had a noticeable amount of HSS over the GL, even with flashing (and for the record, my Moonshine had no flashing, and I mean none. Actually one of the cleaner discs in that regard that I've gotten as of recent) but they both had roughly the same amount of low speed fade. They could make a very good Teebird/Eagle-X type combo, I would imagine.