Mine is fine, with early firmware. (I don't know if you can call putting it on a wide-open public server actually AT apple.com, with not so much as a generic user/pass, and LEAVING IT THERE freaking all day long a leak, per se.)
Frankly, I don't buy SPX is anything but a fake. Come on. The "I work for Apple innuendo"? Please. He writes things about it being a dev build for dev units that only someone on the iPhone team at Apple should know. And the first rule of fight club is you don't talk about fight club. And he just registered yesterday, and his first post, and subsequent posts, were all during his "busy day", so would have very likely been posted from a Cupertino Mac on a Cupertino network on an Apple IP. Can you say, Please fire me now and sue me for violating my NDA in a huge way?
Seriously, I was once in a medical forum debate, with a bunch of smarmy, foul-mouthed, egregiously pompous and very, very wrong, third and fourth year med students. About 80 posts total, I posted 20 - 25. It wasn't sweet of me, I admit, but they were buttheads and refused to even LOOK UP the data to see they were wrong, so about post 5 I identified myself as a fellow in neurology in the Johns Hopkins hospital systems. The HOPKINS, for God's sake. And all about 12 of them bought it. One of them, one of them who was no being a complete dolt and jerk on top of it, she sent me a PM and asked, "You're not really a fellow are you? You're just like maybe four years or so into some kind of neurology residency at JH, right?" Ha. I was a pre-med student and I took the MCAT but I never even applied to med school. They definitely should have caught me out SOMEWHERE, but they didn't. Because everything I wrote was fact, or I opined based entirely on fact, and I didn't overreach beyond my knowledge, granted it's a kind of deep knowledge in the field for a person who is officially a layman. But a fourth year med student has done clinical work dealing with neurology. SOMEBODY should have figured it out. (And, no, not one of them did, or they would have shredded me; you have to know how med students are).
The point being everything SPX wrote sounds reasonable enough, it's just not true. Why is my debug firmware iPhone NEVER slowing down or restarting? Maybe it's just that the debug firmware is, ah, really buggy right, and doesn't make 3G calls or debug data dumps like it's supposed to? Seriously, how many of you who did an early upgrade had jailbroken and/or unlocked iPhones? Mine was clean, clean, clean.
SPX is a fake. I have no confirmation what that early firmware was for, but I again say I suspect it was for the STORES to have the latest firmware on the demo units, and Apple didn't take it down right away because it would work, it wasn't going to hurt anyone, and they needed the stores to have access to it. In fact, I don't know they ever took it down; they just asked arn to remove the link. They didn't C&D him; apparently they just asked nicely and he politely complied.
Noticed some slow down in a few apps initially, Monkeyball crashed once but nothing that would make me upgrade to the official unless that enhanced location ability is still available. 
