I have owned my Sparrow 16 (hull #19) for since August 2008. I love it.
I am at least the 3rd owner and bought it in the Spokane WA area. As soon as I bought mine, a second came up for sale in the same area.
I haven't had it out too many times to test it yet but I know it can sail quite well in light winds. I'm looking forward to taking on the big lakes of north Idaho next summer.
I find it pretty easy to rig and maintain. Not having a centerboard means much less maintenance. There are no spreaders and no backstay so setting up at the ramp is easy. The keel presents a bit of a problem for launching. My solution was to add a telscoping tongue that increases its length by 7' just for launching.
The most definitive review of it I've found was done by the magazine Small Craft Advisor. I highlty recommend it. You can order it at their website.