I have always been a fan of their Sunset Wheat beer, but I finally gave Leinenkugel Summer Shandy a chance this summer.
It just had a simple lemon taste that wasn't overwhelmingly sweet like some other Lemon flavored beers I've tried.
I would easily pick this over Samuel Adams Summer Ale.
Here's my short(2 min) video review on it if anybody is interested: http://www.youtube.com/watch?v=vp-AUuHAiqk