I own the old version of the Crush 100 1x15 and have been happy with it since day one. It sounds fantastic to my ears, and when I've played through it at jam sessions and small town punk gigs, it's had more than enough power; and it gets compliments from people whose opinion I respect, who have played much nicer basses and guitars than mine through much nicer amps. Even a couple of folks who've got experience in audio engineering have told me it sounds awesome.
They're solid state, convenient to move around, easy to set up, and even have a built-in tuner that's pretty darn accurate. There's an effects loop, which is a nice add-on at its price point. It has a DI, which can come in handy. (I know I would've appreciated that on song night back when I was a highschooler working the soundboard and PA at my own church!)
Orange redesigned the geometry and made some internal changes on the Crush line a few years back, making mine "vintage," but I'm sure the current version is something your nephew would be able to play through for years to come if he so chooses.
Some people pout-pout the solid state stuff from Orange, but a certain type of person will look down their nose at anything solid state, despite solid state amps being perfectly serviceable even 40+ years ago.