From the limited experience I've had, Hashi is definitely one of my favorite series of Nikoli pencil puzzles. There's a dimensionality that results in a super strong feeling of slowly chipping away at something huge, and plenty of patterns to internalize which makes it super apt for inducing that Tetris effect which makes a lot of puzzle series great.

This is a solid collection of 50 increasingly difficult Hashi puzzles, but they don't feel too different to randomly generated ones and in the end there isn't much of a reason to play this over any other free implementation of Hashi out there, other than being able to log it on a site like this, lol.