Pieter van Leusink completed this cantata set at breeakneck speed, 15 months, which is not that much longer than Gardiner's pilgrimage. I would respectfully disagree with Michael Gahan's opinion that these are better than Gardiner's set. The thing that sets the Gardiner (and Suzuki) sets apart is the consistently high standard of performance. This set has some sterling performances, but also some rather weak ones. Sometimes the soloists, both instrumental and vocal, let the side down. On the other hand, it could be argued that this must be very close to what Bach himself would have heard, given that he often had only a week to write and rehearse a cantata, prior to its performance - I suspect that highly-polished performances didn't happen too often. Having said that, to get all of these cantatas at this price is a bargain, and should be seized, before the manufacturers come to their senses.
This set of discs has been available in one guise or another under the Brilliant label for some years, I think I first listened to it about twelve years ago. I think it is now much cheaper in real terms than it was then, so it is outstanding value. I prefer these interpretations more than Gardiner or the other big names. Of course a lot of it comes down to personal preference but I find the singing and the reproduction clearer and sharper. Highly recommended.