Here is my two cents for what its worth. My Sieg X2 conversion using the Xylotex complete system and the CNC fusion kit.
It worked for 3 plus years until I blew up the Xylotex board just a month ago. Then I found out the hard way I was stuck with a dead board and no way to get it fixed. The 90 day warranty should have been a clue as to after sale support they provide. The motors were OK and enough to do what I needed at the time. The inside of the the box was a mess as everything was glued down to the plastic. I had to drill holes in the box to remove the PS board cover just to check the fuse.
The Xylotex board is really way too expensive these days (at the time there was not much to choose from) as there are so many other choices these days.
I wound up going with a Gecko Board and complete Gecko Drive G540 system from Cantronics.com and Dan Mauch. I cheaped out on the plastic box and now regret it as it has no relays (flood coolant and spindle control) and is too Small to add any to the box. Plus a set of 385oz steppers. The G540 is great except for the connectors, wish it was a screw on and I didn't have to splice on 3 feet to get the DB9 out side of my flood coolant box (the reason I toasted the Xylotex).
First the difference in the performance compared to the Xylotex board and Z steppers was off the charts. Like a new machine and I was moving at almost twice the speed I was before without feeling I was pushing the machine too far past its limits. That is from 12ipm to 24ipm. A similar Z axis access acceleration. I was under the impression my X2 moor was the limiting factor, it was the driver board.
The bottom line for what you get with the G540, A warranty, Board repair (after the fact possibly), Blowup protection on the board for people like me and an isolated breakout board. It is really cheap. Plus 10 steps per rotation and you are putting out 48V to the motors and not 24V. Probably the biggest performance improvement. Again you can directly control a sieg X2 motor speed and a flood coolant with this board (which I have not done yet)
If I looked at the two complete systems I bought Xylotex Vs Cantronics it was only $100 more for the G540 system but you get so much more.