Well, their customer service is actually really bad, I've had to deal with them multiple times, they almost insulted my boyfriend in caps lock, it was awful, and we had to send them multiple messages because they were unclear, also made mistakes on our order...
And not much customization actually, you can't choose to put decals or anything like that on the controller, unless you are a partner of Scuf and have your own custom controller (for PS4, I don't know for X1).
I hope their product is good, because otherwise I'll be really disappointed for the price I paid for it, given that everthing else has been hellish with them.
Also, my parts ran out of stock during build time, they didn't give me the opportunity to wait, they asked me to change my parts, and just gave me a charging cable to appologize.