FF1 & 2 for GBA...Good stuff?

I'm going on a holiday soon, with a few plane trips and bus rides to endure. I want to buy a good, absorbing game which will keep me occupied for a long time.

If the new GBA FF cart worth buying? It's an early final fantasy game, so I'm not sure how it'll turn out. Is it playable for long periods of time? I'm used mainly to the later FF's, so I'm not sure if it's similar in anything but name.

I'd like a comparison between FF1+2 GBA and FF1+2 PS1