Has anyone tried the Brookstone ifloat Waterproof case and sound box, I saw it at amazon. Any feedback will be appreciated. Thanks http://www.amazon.com/iFloat-Waterproof-iPod-Sound-Case/dp/B000PWG4QM/ref=pd_bbs_sr_1/105-9346326-8174033?ie=UTF8&s=electronics&qid=1187891879&sr=8-1