I have one of the new ones. It is a stainless model with the 2.5" barrel and is my main carry piece.
The walls of the cylinders aren't any thicker than the older ones. The barrel isn't tapered like the older 3" model and the ejector rod is shrouded. That is probably where the extra weight comes from. BTW, the gun is only 21-ounces, so it is pretty light.
Mine runs like a champ. The things to know with this Bulldog are the same as with the older ones. DO NOT try to "hotrod" the gun with stout loadings, or you will beat it to death in short order. Also, this design still uses a lot of screws. Just think of it like a Harley Davidson and be prepared to check screw tightness after using. If you find screws loosening up, use locktite.
FWIW, I love my Bulldog. It has a decent trigger, balances well, and feels great in the hand. It also occupies a unique niche of small, lightweight DA revolver chambered for .44 special.
I've swapped out the stock rubber grips for some vintage Bulldog wood grips which I like better for CCW. I also like Pachmayr Compac™ grips. They feel and look better than the stock grips. I carry the gun in a small belt slide OWB holster. It works very well for me.
Here are a couple pics: