I had the Japanese release a couple of years ago but @Fallen92 has pretty much covered it. It’s a solidly presented package from M2, though the Super Famicom games lack good filters so they appear very sharp on the Switch’s screen. They improved on their Game Boy pixel filter with the Castlevania games, though both lack that soft appearance of the Game Boy’s display in real life:
On an actual Game Boy light background colours appear even lighter and less defined/crisp because of the flickering of the screen, which isn’t something that’s replicated (look at the pattern on the ground).
I still want the collection just for Seiken Densetsu 3, though I’m going to wait for the boxed release in August I think.