I really enjoyed the Air Canada lounge. It did get busier as time wore on but was cleaned constantly and dishes were replenished well before they ran out. Also, the design made the space feel a lot less busy than it would have felt had the seats all been placed in unbroken rows - as tends to be the case in AA or BA lounges.
The seat was large and comfortable and featured both power and entertainment.
The crew were polite, friendly and efficient (if a little lacking in oenoligical knowledge).
The food was plentiful, healthy and delicious with a decent selection of drinks to accompany it.
If BA Club Europe was anything like this I wouldn't hesitate to pay the premium every time I fly!