I've been to Bellwoods in all seasons, and regardless of season the beers on tap are always ridiculously good!
In the summertime it can be difficult to get a table (especially if you have a large-ish party), but not impossible. Groups of two get seated pretty quickly, but the wait isn't terrible for larger groups (and well worth it).
The food is also pretty delicious, though a bit pricey. I can strongly recommend their fries, seasonal salads, and asparagus.