If you want something that looks like an Amiga and runs non-AGA Amiga software but isn't an Amiga, and want to spend more money than it'd take to run UAE on your modern computer, then I suppose it's worthwhile. I think it's a really neat idea, and I'm impressed that someone built it, but I wouldn't buy one personally. If one was given to me for free, I'd probably use it for a week then never touch it again.
For me a big part of the Amiga experience is using the old hardware. Using an emulator (I've tried a few times) loses my interest after a day or two. When I no longer can use a real Amiga machine, I may fire up UAE for a game or two once every year or three, but pretty much at that point I'll be done with Amigas.
I guess my point is, nobody but you can say if it's worth your money to get one.