I consider it one of the hardest rom hack on the nds and playing it on set was the most fun I've ever had with a pokemon game. However I wouldn't recommended it to anyone who doesn't at least dabbled in competitive battling and know what to expect to a certain extend. Leonora and Burg are usually run killers and could make you feel like running into a wall until you gave up and over grind but there's so much more you could do to play around them. Some moments can seem like bullshit when your mons got crit'd over and over again but then you realize they are holding a scope lense and strategize around that. You rarely can pick a super effective move and ohko the gym leader mons one by one, but brute forcing is still an option.
It is difficult when you don't know what to expect and still difficult when you do, but the hack doesn't force you to play in any particular way in order to beat it. The guy who made the hack did make some changes regarding typing and moveset to make some underpower one up to par with others, whether you like it or not is up to you. Furthermore, you can tell he actually put thoughts into wild pokemon distribution instead of running it through a randomizer and calling it a day.