According to this website:
xclusive jet Crewsolution is a sister company of Xclusive Jet, and has been around "for 20 years". They also have their own website here:
crewsolution.com.
Though they have an office in the U.S., I've heard nothing about them, good or bad, that in itself is usually a good sign.
I'll ask around at work next week and see if any of our pilots have heard of them.
Ken