I've only played with an Instinct for a few minutes, so my views should be weighted as such, but the Instinct, while it is a decent phone in some ways, it is no iPhone. Actually, it's not even that close, IMO.
Island would really like the web experience on the Instinct! 
Here's a review from Gizmodo, there are many more if you Google:
http://gizmodo.com/5014419/samsung-instinct-full-review-verdict-best-sprint-phone-ever-best-samsung-phone-ever-too
Excerpt:
Quote:
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Despite what we and other media have hinted at, despite what Sprint itself is spending a lot of money trying to convey, the Samsung Instinct is not an iPhone killer. To be sure, Samsung and Sprint borrowed liberally from the iPhone playbook when it came to look and feel. But the comparison itself isn't fair: The iPhone is a software platform that is growing every day, soon to have a host of applications that put it squarely in the smartphone category along with BlackBerry, Palm and Windows Mobile. The Samsung Instinct will never be mistaken for a smartphone. Then what is it? It's the best carrier-centric feature phone I've ever seen, a delight to use for many—though not all—of its intended purposes.
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And while I cringe at the thought of defending any cell network provider, ATT does have, arguably, the best 3G network in the US.
Only my 2¢
Best,
Kurt