I didn't see the DS Experience ensemble, but I was at the very first concert of "The Straits" at the Royal Albert Hall, which was the first incarnation of this band, as Terence Reis was the guitar and singer, and Chris White was there too.
I have to say that Terence Reis IS VERY GOOD.
Alan Clark and Phil Palmer were there two, that in the end would form DS Legacy, and althought they are very good, the main guitar player and singer is not. And as a band they lack of something, actually they are worth just for the moments Clark and Palmer are in the spotlight of the songs.
So, as Chris Whitten say, if DS Experience are playing close to you, seems you are going to enjoy the best show from the bands with ex members.