Thats exactly what I use Rhys 7 and 9 Nomad

They are perfect for wave riding. I cant even use the 9m SB in the surf without wishing i was back on the 9m Nomad.
The Switchblade 9m turns fairly fast but it turns in more of a larger Arc with more power so I find it pulls me off the wave face. Where as the Nomad turns much tighter and switches back in direction almost on the spot.
The Turning speed on the 7m and the 9m Nomad is very fast and you can generate enough power by flying it up and down through the window to get you going on a Surfboard in fairly light winds.
Rhys is right about the Nomad not being so good as a wakestyle kite, I too find that when riding a twintip and doing load and pop tricks the Nomad fly's to far forward when you are loading up and you kill your power and speed making it hard to find any decent power enough to pop from.
In stonger winds this is not as noticable and you can load up a little more without pulling the kite out of the window but it dose still shoot forward.
This respons to edge imput and flying forward charateristic allong with the fast turning speed is what makes it such a great surf kite.
Ill try and explain the "respons to edge imput" benefits on a wave...
When you do a bottom turn and press on your inside rail the kite loads a little and fly's forward allowing you to set yourself up in the right position on the wave face for a top turn, as you make your top turn and again apply presure on your inside rail through your turn the kite flys forward and back down the face setting you up for your next bottom turn.
Once you get this dialed you can really start surfing and smack out heaps of combo turns on the same wave and snake your way down the line.
The Nomad is all so super stable for un-hooked wave riding and because its a little less powerfull than the Switchblade it is easyer to un-hook and not get to over powerd on and pulled off your board.
For me its the best surf kite only down side is in lighter winds it is a bugger to relaunch. over 15 kntots its super easy and rear line relaunches fine.
Regards
Luke