Pimm's is pretty widespread these days - just about every non-dive bar seems to have a bottle on the shelf, so you should have plenty of chances to try it without committing to a whole bottle. Owen & Engine even has a small Pimm's Cup section on their drink menu, with 2-3 variations.
Once mixed with some sort of sparkling citrus beverage (plus chopped cucumber & assorted fruit), I haven't noticed any bitterness, quinine-y or otherwise. It's a pretty smooth, light, easy-drinking refreshment.
toria wrote:I am assuming Pimms Cup can be purchased at the liquor store and the rest such as the lemonade part can be made at home. Also instead of lemonade so some use other fizzy things? Do any bars serve Pimms Cup cocktails?
I was reminded by a pair of Brits once that, in the UK and mainland Europe, fizzy lemon-lime sodas (7 Up, Sprite, etc.) are labeled as "lemonade", so when the recipe calls for "Pimm's and lemonade", a fizzy citrus drink should be used.