I picked this up on Amazon for just under $20. If I didn't already own the previous Looney Tunes Golden Collections, I'd say it's a great bargain for that price and a worthwhile purchase. However, I see no noticeable improvement in picture quality in going from DVD to BluRay, at least not for the vast majority of cartoons.
The real reason for buying the BluRay over the DVD is the added 3rd disc with lots of bonus (again, mostly previously released stuff) and the extra Tex Avery cartoons. Looney Tunes fans have long wanted a proper release of Tex Avery cartoons, but here it's a mixed blessing because these were not remastered and do not look as good as the other cartoons. Also, if you've already got the previous collections, there are only about 10 "new to DVD" cartoons here.
The Golden Collections had 60 cartoons per set and lots of bonus features. These Platinum sets have only 50 cartoons each but are priced lower. However, most of the cartoons were already released and few are new to collectors which makes it hard to justify the cost. A new, third Platinum Collection is due out soon... from what I've read on-line so far, it doesn't seem worth buying as it has hardly any new to DVD cartoons. Again, if you don't already own the Golden Collections, these platinum BluRay collections are good when you find them on sale, otherwise wait for the sale.