Not sure what to think about this one - marketing is a bit cheeky, but essentially they are a very good tribute band with a legitimate connection to DS. As for calling themselves "The Straits" - well, they wouldn't have called themselves "The Dire"!!
I don't think I'd go - I don't really like tribute bands (despite being in one!), but as long as people know what to expect then I suspect it will be a good night.
But it does feel a bit like going to see Blondie without Deborah Harry, or Simon and Garfunkle without Simon. MK is/was Dire Straits and really this is just some of his backing musicians.
The guy standing in for him is obviously a very good guitarist, but to me the guitar in their version of MFN is more Richie Blackmore than Mark Knopfler. And the joy of Mark's voice was that he can't sing, but in the same way that Bob Dylan and Tom Waits can't sing - which is much cooler than the waaugghh!!! singing of your average rawk star, which is what this guy is doing.
It reminds of a review I read of the Notting Hillbillies album where the reviewer complained how few songs MK sang on saying his under-use was like "being superman and then choosing to take the bus to work".
Good luck to them all the same, like I say it'll probably be a great night out and the standard of musicianship will be high even without the inimitable MK voice/guitar.