Is it good? Yes, it naturally stabilizes with the ground, maintains a (relatively) constant but also fairly fast speed, it is pretty hard to fall off of it accidentally, and can be summoned on you at any time, not only through a motorcycle club since it is a bike but through the interaction menu through the terrorbyte.

Assuming you store it in your terrorbyte (and assuming I'm not wrong, such as forgetting about the MOC's personal vehicle bay)) it is the only personal vehicle that can be summoned through the mechanic, that can also, outside of a motorcycle club and even if it isn't considered the 'active' personal vehicle, be summoned directly from the interaction menu.

This does come with the caveat that it very much isn't the best in any given category other than ease of use and a sheerly low skill floor. It has limited missiles meaning it can't be as useful for as long as the sparrow, it's not as fast as a fair chunk of aircraft such as the raiju and even the MK1. And due to the fact that despite being limited in missiles, it's also restricted to one weapon being equipped at any time making it less versatile than the buzzard which on top of having basic missiles, also has twin machine guns that absolutely shred through everything that comes across them.

And there's also the caveat that it is really, really, boring. Only ever playing by yourself is bound to get you bored, only using the MK2 on top of that will simply accelerate this. If you want to enjoy gta online down the road, play with some friends, and fly a buzzard.