Acoustic pickup (for Martin)

[donf]

I'm looking at a Fishman Ellipse Matrix Blend pickup for my Martin D-16GT.

I was wondering if anyone uses one of these things.

It's half rounded that fits under the soundhole. Some have soundhole mics. I see a couple of different types of Fishman Ellipse pickups and was trying to get input on which one would be the best.

Here's a shot of one of them on eblow;

http://cgi.ebay.com/Fishman-Ellipse-Matr...1QQcmdZViewItem