Worth it?
Not sure, think you have to answer that question.
However for me it was for the following reasons:
1. Wanted a laptop replacement from my current 17" to use when doing weekend MRs. The iPad's worked well in this regard and I've been pleased with how it's handled what I want to do (ticket management, posting on FT - with the aid of my BT keyboard - , media.)
2. Wanted a way to replace my $65 VZ data card with unlimited internet. Got the 3G, signed up for the $30/month data plan, jail broke and set up tethering and have been very pleased with the performance. Obviously when I'm traveling I'm not planning on taking both my laptop and iPad *but* there's a good chance I might be moving for work and if I can use my iPad data connection for my home internet, then I'll save paying a local telco x$/month for DSL/cable.
If you're on the edge I'd suggest picking up an iPad from BestBuy (milo.com will search local inventory for you) and try it out for two weeks. If you like it, keep it. If not take it back to BestBuy and return it (BB charges no restocking fee, at least per the 3 store I talked to in the greater IAH area.)
Hope that helped.