We just came back from testing the Ikelite package with the 18-55 lens and we were very pleased with the results.
Haven't had a chance to try it out with the Tokina 10-17 but I must say I loved the range I had with the 18-55.
You can get some really nice wide, mid-range shots and even some close-ups nearing macro.
I used a single YS-D1 with the setup, and encountered some odd issues where the strobe would fire a second time after each shot. Sync was OK but batteries drained faster because of this issue...
Here are some shots and a link to the short review: