I caved and bought the original Legacy when there was a mild discount (should have waited for Black Friday).
The shape of the original Legacy bodies (normal and pregnancy) are lovely. Legacy has a much fuller bust with a more natural shape than Maitreya, the nipples don't point up to your teeth like some other bodies and with good physics, they drape really beautifully. It looks better, to my taste, but especially so at the high and low ends of the spectrum.
The Perky is, I think, actually more comparable to Maitreya's shape, but much prettier at the larger numbers than Maitreya. And they did a great job with getting creators on board to make content for the Perky, so it's a much easier time dressing it, though you may want to wear less.
Alpha Cuts. Although not apparent on the HUD, they really are superior to many bodies and you can have more precise fits if your clothing does not come with an alpha.
Deformers. You can still wear a lot of your old clothing with it, made for other bodies, using the included deformers. HOWEVER you will not be able to salvage everything. The middle of the chest may stick out from some clothing designed for Maitreya. Shoe compatibility is not an issue.
Included skins. It comes with a wide array of included skins and they are pretty lovely, in a decent, inclusive skin tone range.
The Advanced Materials Editor. You can drop your own textures onto the Material Editor hud and tint, full bright, glow and adjust transparency. It's not bad but could use some more functionality since bump and shine really only apply to the non-BOM skin layer.
Price. Is it worth double the existing bodies? Maybe, maybe not, but it's definitely something that gives most people pause.
Slow HUD. Sometimes the responsiveness between the HUD and the Body is slow.
No Omega compatibility. Unfortunately, unless that clothing/tat/makeup came with system layers, your Omega appliers are useless at this time, and for the foreseeable future. They like to lie to people and say Omega is dead and give technical mumbojumbo as to why they can't (although for the actual base layer, they can't), but Omega still has uses and they COULD make Omega available for the clothing layers the same way Niramyth does for the Aesthetic since their clothing layers are SL UV compliant. They just choose not to. Or, rather, I'm told that it's not high on their priority list. I think they're just waiting for Omega to die but that is not happening any time soon. If you need Omega compatibility, pass.
Wonkiness. Sometimes you get weird errors like stack heap errors or the body just stops responding to the HUD. You will find yourself refreshing attachments or relogging more than you ever imagined that you would with any other body.
The HUD is still networked so your old purchases under the TMP system, if you had any, are still available in your HUD. But if you don't need those items or once they are applied to your body, you will not need to wear the HUD any longer for them to show up. Newer appliers do not save (or do not save exclusively) to their servers, they will apply directly to your body like any other body.
Overall: It's a nice body. Very beautiful, and the alpha cuts are really good. HUD could use some improvement but it's not a showstopper. For the price, however, I wish it didn't glitch as often as it does. It's best bought at a deep discount. And that's my impression. Good luck.