They're excellent.
Or you could wait the boxed version, but I don't remember which games are included. (But Power Drift is !)
The boxed version with Power Drift is already out (in North America and Japan, not Europe/Australia) and contains none of the games on sale here. It has Power Drift, Sonic 1, Puyo Puyo 2, Fantasy Zone II W, Thunder Blade, Galaxy Force, Altered Beast, Maze Walker, and Fantasy Zone II.
The
other box which is Japan-exclusive at the moment has Space Harrier, Ecco, Shinobi, Out-Run, and Super Hang-On among other games.
Streets of Rage 2, Gunstar Heroes, and After Burner II are download-only at the moment, in all regions.