Huge -1
Does not seem suitable for implementation in an RP server despite seeming cool for just dicking around in a locally hosted game with some friends, as is seen in all the videos here.
Less abilities, hilts, stances, crystals: Having to port over tons of these to make this not a massive downgrade over the current system would be a massive pain in the ass. And it's not like this could just be skipped, as people would need to retain access to the items that they purchased with lots of money on the store.
No pre-made sabers: There is no way to give someone a pre-made saber (such as Trial Master) to be used for trials and such this is not good. You'd have to give people items that you can't really be sure that they got rid of after, since it'd just stay in their inventory permanently unless you verify that they drop it then remover tool it. It'd be really easy for people to get away with staff abuse where they give someone free hilts or crystals.
No item spawning for crystals or hilts: There would need to be a system developed to provide crystal and hilt drops unless you just want to provide all of the basic ones by default, which would be kind of lame for youngling initiation.
Incompatible: There are reports of this addon not working with deflections against some different NPC weapons which would need to be tested against every NPC weapon we currently have, and with how new it is I'm sure there are plenty of other bugs regarding compatibility with Synergy's addons.
Permissions issues: There's also the fact that this requires permissions to spawn SWEPs to be given in order to be able to create a saber from your items, which would have to be tested with Synergy's restriction system to see if it would be possible to only give access to spawn these sabers.
Lack of progression: There is also no real progression system implemented via skill points, where people could get more abilities as they go. This would have to be custom developed.
There is no saving of the inventory when a user disconnects: I created a local server via the Dedicated Server script, joined, gave myself stuff, and when I reconnected all of it was gone. A way to keep these items would have to be custom developed.
You do not spawn with the saber equipped: You have to enter the menu each time to equip it. This might be able to be worked around with a command though. There is also no current way to make it so you couldn't just have clones giving themselves their saber to mess around with while on their clone life, the menu is always there.
This could be cool in the future with significant development, but in these early stages of the addon it really is by no means comparable to the depth that WiltOS sabers offers.