I've shopped here several times for kiteboarding equipment. The selection is pretty good but do your own research because the staff here seem to have pretty strong opinions in favour of certain brands...and sometimes they trash on other brands, so it is best to talk to others if you are not strongly brand loyal to Cabrihna, NP Surf and other lines carried at this shop. But like I said, the selection is still pretty good compared to other local shops.
I purchased a product here a while back and emailed the contact email regarding a possible warranty issue, and even simply asking for advice on how to repair myself. I never got any response back from Silent Sports.
So keep that in mind when choosing to shop here.
**Edit** Despite the above, I would still shop here before I would choose their main local competitor Boardsports.