I've used nothing but those on the interiors of boats, both mine and customers, for about 15 years now.
On the last several boats, I've been using a Porch and Deck Enamel from ACE Hardware. Seems to hold up every bit as well as Brightsides, and as said, is SO much cheaper.
Years ago I had a sign up advertising my furniture repair shop- painted with acrylic latex, that sign was stolen 15 years later when we were moving the shop- had planned to keep on using it, because it looked as good as new.
I'm sold on the stuff.