No problem! :)
I was thinking about getting a countertop one, but I'm thinking about it and I think the hose will reach from my shower to my sink... Hm. Do you think your shower and sink are close enough for that?
The only thing I don't like about this shower one is that there is no easy 'off' button. It's not a problem when you're in the shower already, but the on/off nozzle is by the shower head. I guess technically the water shouldn't go spraying everywhere if you do it right, though... Just gotta close your mouth and get the hose back in the shower before you start drowning, haha.
I'm going to give it a shot and see what happens!
Also, here's the Waterpik brand one for comparison.. It actually has an on/off button: http://www.amazon.com/gp/product/B00B2GZ0VU