6 months ago, I would have said save your money. Now, I would advise you to get one. Especially if you want Retribution (game is awesome).
The pro's do outweigh the cons.
+ growing number of quality software
+ Multimedia purposes you can use it for(web browsing, MP3 player etc.)
+ plenty of cheap games to pick up.
- fairly short battery life (from what I hear)
- to date, there isn't as much quality software as on the DS.
Overall, I'd suggest picking one up.