Although I decided in the end to go for the Gardiner (a decision I don't regret), it was a close thing, and I still indulge in the occasional Suzuki, whose performances are also outstanding.
I was prompted to buy this one by the presence of a favourite, BWV 82 "Ich habe genug", and it gets a nice performance here. The others are less well known (to me anyway), but were excellent. When BWV 52 started, I jumped up because they'd clearly put the wrong disc in the box. But no, the opening sinfonia is indeed identical to the opening movement of Brandenburg Concerto No.1.
Aha, if only I had enough money and enough time to listen, I'd have this cycle too...