I ran into this very dilemma..Excalibur vs Jet. Spoiler alert; I went with Excalibur. Here's what went into my thinking:
Jet is made by the same manufacturer the OLD Excalibur was. So I think it's safe to say build quality is good and uses many of the same design components as the old Excalibur. Jet makes great tools and I'd be happy with them, for sure.
I think there is a bit of bad blood (for those in the know) for how Excalibur disappeared without word, then appears without much of a mention at a new manufacturing facility, acting as if nothing has changed (bad PR in my opinion). So I think people are a little unwary and suspicious about the build quality. The bad reviews I've read, it sounds like their customer service is pretty bad...mostly at getting tech support. I'm not sure if that's because of the company, or because Ray at Seyco has been so good at support and that has reflected back to Excalibur. Anyway, I hope Excalibur steps up their game.
But as @Scrappile mentioned, it's still the same design, just a different factory. They've switched factories before without issue (Canada to Taiwan), so I'm guessing (& hoping) that it will be a superb saw still. Unfortunately, the new saw hasn't been on the market long enough for any track record. So time will tell.
Here were my deciding factors:
The blade on the Jet sits forward further than the Excalibur. Which means there is less surface area in front of the blade to control your work piece. This could be good on your neck/shoulders, but maybe not so good for controlling larger pieces.
I don't like the clamping system on the Jet. The top clamp is pretty slick, but I don't like the bottom clamping system. You need to use a removable chuck for the bottom. It can be tricky to slide into place. It can be difficult to set the blade properly since there is no back stop to position the blade. And it's not good for top feeders. With that said, it probably won't take long to get used to it.
If I decided to go with Jet, I'd buy the Pegas replacement jaws for the bottom, and maybe top holders.
The Jet is a bit more expensive, especially if I'd replace the clamping mechanism to get the saw where I want it.
Excalibur supposedly has poor tech support, now. I'm hoping I won't need it. I've been around the saws long enough, I don't think I'll need it. But if I get stuck, the fine folks at SSV know a lot more than me and always willing to help.
Excalibur is sold by Home Depot. So if it's terrible, they have a good return policy. Just return it and buy a Jet (which they also sell). LOL
I did buy the Excalibur from Home Depot. It's currently on the truck now, and I'll get it in a week or two (sooo slow...I've been spoiled by Amazon). So I can't say anything about build quality. But I'm hopeful. And it'll be a great upgrade from my Craftsman 16".