The major benefit most make use of is the 10-15% off dealer servicing. The club has 44 dealers of 48 that are on the list. Obviously it's at the dealers discretion but most of them are true to their word.
When you have a £400 service bill the discount can be very handy.
depends on how earth shattering you want to be really. But when a big bill arrives its great to know that you can save a bucket of cash.