I purchased the set with the imperial brad point bits, not sure I would see much benefit in the zobo forstner bits plus they only had the metric set available. I was going to purchase one of these a while ago but then they were sold out, possibly discontinued, before I managed to make the purchase.
I might be wrong but I think they discontinue the sets every few years and release a new set but possibly not right away. I think the last set was 2011 and this one was from perhaps 2013? I would guess there might be another one in 2015 with revised contents.
I already have a bunch of the individual pieces, twin box, countersink, etc. but there were a few more items from the set I wanted and they would have cost perhaps 75% of what the set cost so now I have some backups which is good but pretty much assures me that now I will lose one or both within the next 6 months.