I have two advantage 1s and two advantage twos. All are modified with either the blue-wizard board or the tint (or predecessor) boards as well as other mods (sound dampening, switch swaps). All but the blue-wizard runs QMK. I've been using this line of keyboards for over 20 years at this point.
The 360 is quite nice with a few caveats.
1) the split is excellent, the extra buttons are great.
2) the backlight is kinda pointless, I have it off, why waste the battery. I don't understand why they didn't put it in the non-pro... BOM price i'd guess.
3) I got the palm rests, they are comfortable and kinda a little leatherette material so they won't get gooped up as badly as the old advantage 2 cloth pads.
4) the keycaps that come with it are SHIT. Buy the PBT caps with it, or do like i did and buy them two days after you get your keyboard.. Even the the home row is shit if you are used the adv1/2. I took the homerow off of one of my original advantages and put it on the pro. You might be able to swap all the caps over, but there are a few extra keys on the 360 series that it won't cover, and some of the legends will be wrong.
5) The adjustable tenting is nice but somewhat limited, it has essentially three settings.
6) It certainly sounds better, not the hollow of the adv1/2 (which i stuffed with foam to suppress).
7) You might want to buy from upgrade keyboards unless you are ok with browns. I haven't opened it up to see how hard it would be to do a desolder/switch swap. Brown are ok for me, but I do enjoy my adv2 with silent reds.