Positives: One of the more sturdy larger Legos I've built so will be ideal for swooshing around; easy enough to build, so ideal for young/new builders; very well detailed and much better than previous versions of the Tie Fighter; as I understand it, some of the minifigures in this set are exclusive to this set, which is a bonus for people who are enthusiastic about the minifigures.
Negatives: I don't think it's worth the RRP, so if you're considering buying I'd say make sure you're getting something off the RRP before purchasing; the minifigures for me were a little disappointing - I usually like characters from the films to be the minifigures, but that's just me; for me it was just that little bit TOO easy to build (which probably ties in with why I don't think its worth its RRP), only taking me an hour, so if you like complex builds I wouldn't recommend this one.
Overall, it's a nice addition to my collection, but there really isn't all that much outstanding about it and it wouldn't be on my list of sets to recommend to other people. If you're getting a decent chunk off the RRP, and you like collecting / playing with these things, then go for it. Otherwise, I wouldn't say it was worth it.