Ikelite housings will compress to some extent at shallower depths than that, so you may have control issues even if the housing remains intact (which I'm pretty confident it would to at least 200 feet). I had to send them my R5 housing to adjust a couple of the top buttons like the video record button that was sitting too close to the camera and would compress into the button (pressing it continuously) at depths greater than 120 feet or so. It's not the springs, but the actual length of the button peg being too long as the plastic it sits in compresses inward a few mm, resulting in the peg hitting the camera with enough force to press the button and you have no way to un-press it.
I'd venture a guess that you probably won't have issues with anything on the rear of the housing because that's a big flat thick piece, but the curvy contoured bits on the front part of the housing seem to want to compress a bit when you go very deep.
That said, this can all probably be adjusted for with shorter button pegs if you're going to those depths routinely. It'd just change the feel a bit on shallower dives because you'd have to press some of the buttons a lot deeper to make contact with the camera.
