Last weekend I tried Atwater Vanilla Java Porter on tap at a T-Bonz in Ellicott City. Here's how the brewer describes it:
A robust porter made with chocolate malt. We blend it with Vanilla and Java beans, and balance it with U.S. Golding Hops.
I found it interesting - dark and rich with a small thick head. However, the vanilla flavor was overpowering. It tasted like vanilla extract was added after it was brewed vs. being infused during the process.
Bottom line is that I am not sorry that I tried it but, unless the selection of microbrews is scant, I probably wouldn't give it another try. If you like trying new things and have never tried a vanilla flavored beer, I'd say give it a shot.