I'm going
I saw him with Roxy Music the last time he was in Switzerland too, in 2010 at the Montreux Jazz Festial.
I really liked that show, I'm excited to see him "unplugged", which contrasts a lot with his Roxy Music past. I will post a review
For those still undecided:
you have to consider that you have to stay at a hotel in zermatt (these are getting booked out rather quickly due to the festival and the ski season which lasts still in april in zermatt). After the concert there is no way to get back down the valley, (zermatt allows no cars and there are no more trains/buses) so you have to stay in zermatt. You can get some attractive combined packages: hotel stay+concert ticket on their website since the concert is expensive (even for swiss standards

)