I love my XLS, even at the base price. They're an excellent start into the world of what a great DIY kit can do.
The X-Statixs have a very similar tone, but the mids are spacous and offer a fuller, richer tone and have a nice presence.
I had a pair, but shipping caused damage to one of them, so in order to get a refund I had to give the damaged tower.. so I'm in the process of ordering the kit & flatpack for a replacement tower, as well as upgraded replacement crossovers & tube connectors for both towers..
I'm currently in the process of building my own NX-Studios! I didn't get the chance to hear Danny's personal pair in person but from Tyson's review, as well as Ron & his Bro's video, and SonicJoy's build thread. they're often regarded as the best bookshelf speakers anyone can buy.
I'm hoping to have the cabinets finished up by this month so all I'll have to do is assemble the crossover and install the components and enjoy, once the drivers are back in stock!👍