I was lucky enough to be invited to the tennis, by a Queen's Club member, yesterday and it was a real treat. The seat was comfortable, the view was great and the tennis - especially the Nadal-Nishikori match - was riveting.
The Stella Artois is a great prelude to Wimbledon - good for spotting future stars (18 year old Nishikori is definitely one to watch, as is young Latvian, Nilgis). The venue is more intimate and welcoming than Wimbledon; if you can get into the Clubhouse - with its vibrant buzzing and friendly atmosphere - it's easy to bump into the players and celebs.
Ticket prices vary according to the day you attend, although they're not cheap, you get decent value for your money and they're easier to come-by than their Wimbledon counterparts. If you fancy popping-along late in the day there's a possibility of buying returns for just £5 and you'll have the opportunity to still see a match or two.