I fished Big Well a few times in the past. The last time was last December.
Pros
Good quality fish.
Very friendly staff.
Excellent cooked breakfasts.
Comparatively cheap to fish (I think it's £10 for C&R)
Crystal clear water in at least one of the lakes.
Great place for teaching my 10 year old to fish.
Cons
Basically what MichaelL said. It feels like you're fishing a pond in someone's back garden. If there's more than 4 people fishing on the main pond they'll be casting across each other, it's that small.
A yellow 'buzzer', czech nymph or a bloodworm imitation fished static under an indicator usually works well there.