Well I bought it. So this is what I have to say about it.
1) There is no discount for Legacy. It's 5000L$ straight up. The classic that they have is discounted, but lacks the features of Legacy.
2) Deformers do work, they fit most of my Maitreya fitmesh clothes perfectly. However, because of clothes from like Blueberry will not automatically alpha the body (because the scripts are meant for Maitreya,) so you have to alpha yourself.
3) The Alpha controller is not total trash. It's a 3D alpha controller much like Belleza, but not as trashy as Belleza. Belleza's alpha controller I absolutely hate as alpha'ing a part of your body does both front and back sides. Legacy doesn't do this allowing you to alpha the back and front individually like Maitreya does.
4) Somehow the Deformers makes your shape look similar to Maitreya. You can even wear it naked. However, the deformer takes awhile to take effect (Maybe will be faster in a future update.) So copying the body and making outfits for it, which is what I do, your body will be poking out of your outfit until the deformer takes effect.
5) Appliers are in the works from what I understand. What kind of appliers the body will work with is unknown. So no changing custom bought skins as of yet. However, it is backwards compatible with TMP made appliers and is available all in hud if you bought installer packs when you had TMP.
That is all. I like the body. It's a shot in the dark for me, but I am making a gamble. Call me an idiot if you wish. If the body fails again like TMP did, I can still fall back to Maitreya.