I've also heard that some of the users that had phones bricked by the update were, in fact, doing so on a rooted phone. I have no idea if that is just FUD, but it wouldn't surprise me in the least if it were true. In my opinion, you have to be very careful where you get your custom firmware from. Since you really have no idea what those guys are doing, unless you're a programmer, you're doing nothing but taking the word an anonymous person on the internet that it won't do anything malicious/stupid/etc.
In related news, the update didn't brick my phone and I have noticed that the grounding issue has been solved. Though I can't imagine for the life of my how a grounding problem can be remedied via software update. I've also heard through the grapevine that the update unlocked 802.11n, though I can't confirm that as I'm still rocking my WRT54GS (DD-WRT in the house!). If anybody has an N router, can you please test this?
Heavy is good, heavy is reliable. If it doesn't work, you can always hit them with it.