I just finished bottling my first brew in one of these.
The lid: It is much easier to pop out the airlock stopper to take a gravity sample than to pry the lid off a bucket. Its is also easy to take off the whole lid if you like. There is also plenty of headspace.
The weight: Like a bucket, the weight is negligible compared to the liquid inside.
You can see inside: fun, but not critical.
Punted bottom: this worked nicely for racking.
No handle. I ended up picking it up by the lid. Definitely going to need a brew hauler.
The price: especially once you add in a brew hauler, it is quite a bit more expensive than a bucket. It isn't terribly expensive in the scheme of brewing equipment, but enough to be a factor.
Even with the stiffening contours, it seems more flexible than a bucket. I don't know if that is real, or just because it doesn't have a handle so you are more likely to want to balance it by applying force on the side of the vessel.
Too soon to tell:
Cleanliness. I don't know susceptible to staining and scratching it will be compared to a bucket. The large opening makes cleaning easier than a carboy, but the bumps and ridges are slightly harder to clean with a sponge than a smooth bucket.
Overall, I probably won't buy another. The bucket seems like a better value for money, and even if price were no object it isn't clear cut.