I've always been apprehensive about the newer technologies as well. I've been playing the same batch of Head Prestige Classic's since around 1995. Throughout the years, I've tried a few of the newer sticks from the Prestige line. The only ones that got my attention were the i Prestige, and the new Youtek Prestige. I wish I had picked up more of the i Prestige when they were readily available.
I'm finally making the full switch over to the Youtek with some customization (lead, and leather replacement grips). I'm down to two of my original classics, and finding replacements is both tough, and expensive. Head did release a batch that TW was selling a few years back, but they were apparently different from the original's (different factory/ materials/ processes) from what I heard.
At this point, it's time to give in to the newer stuff. Although I do enjoy hunting down a stick I've wanted, I like knowing that if something happens, I can just pick up a new one no hassle. That is until the next Head "technology" is released. For the most part, I've always played Head, with the occasional Pro Staff mixed in.
As for the US Open Nike's: I had a feeling that although the Black/Lime look cool in pictures, they would in the end look strange in person.
I'm picking up a pair of the black 2K10's this weekend, and possibly the white/Lime 2.3's. Only if the 2.3's don't feel like bricks on the feet. I have a feeling that they might, just because all I've played in the last 6 years are the BFII's, Vapor Line, and Breath Cage line.
If I remember, I'll update with pictures.
Oh, adding to SinnerP's list of legit online retailers: www.tennisexpress.com is also a good place for supplies. Got some Oscillates from them a few years back.