I bought an Ultrasaber last October to have for Halloween and for TFA premiere. Here are my thoughts:
The saber itself is great! I only use mine for display/costuming (not for dueling), so I can only attest to the way it looks, and not the strength of it, though it feels quite solid to me. The blade is bright and evenly lit, the sound is crisp and loud. The blades look especially fantastic in photographs/video. I have bought several interchangeable emitters/pommels for mine so I can achieve different looks with my saber, and I got the Emerald driver so I can make the blade ANY color I want (blue, green, red, white, yellow, purple, even brown, literally ANY COLOR).
They aren't as detailed/pretty as saber forge hilts, but Ultrasabers is more affordable and customizable.
Now, all this being said, I DID have a rather poor experience with customer service. Many give them good reviews, and I'm sure Ultrasabers is usually good with customers, but in my case they were... frustrating. My order arrived with the wrong features added (or missing) and I wanted to return the saber for store credit so I could use the credit to order a new saber and upgrade to an Emerald driver. They said I could exchange it for my original order, but since it was "custom made" (its a standard saber with stock parts) I couldn't return it. Long story short, after many back and forth emails where they began to insult ME, we finally came to an agreement, which cost me about $50 more than it should have, but I got the saber I wanted.
Probably my fault for making the situation complicated, but they could have acted more professionally and not insulted one of their customers, as I never insulted them.