Got mine this AM.
First, zero activation issues. They scan it and about 30s later it provisioned services and everything worked.
Frame of reference: My previous phones were Original EVO 4G, Samsung Epic 4G Touch (ran it stock for a while, then rooted and I've been on CM10 4.1.2 for a few months).
First impressions: I picked it up in the store before deciding to buy it and was instantly impressed. I wasn't convinced I'd buy it since I love AOSP Android and running CM10 on my E4GT has been excellent. That being said...the OG is FAST. Like super fast. I tried my best to get it to stutter in the store and couldn't. I've only had the phone for 5hrs, but I honestly don't mind their Skin modifications. You can feel that it's a slightly tweaked version of vanilla Android, not a complete UI overhaul. They've left a lot of the menus and options exactly how they are on AOSP. Their stock texting app is 'ok'. I'm not a huge fan of their LG keyboard, so I immediately installed the Android 4.2 Keyboard APK, now I'm happy.
Hardware: Feels well built. I like the weight, not super light, but definitely not heavy. Screen is gorgeous! Super sharp and noticeably better overall compared to the E4GT. I was sold when I saw the screen alone. I shot some pics with the camera and I'm not agreeing with all the people that are "disappointed" in the 13MP model. I think those people don't dig deep enough into the settings to set the camera software up for optimal results. I took some low light images that looked very sharp, better than my E4GT for sure. Maybe I haven't exploited the flaws yet, but I'm satisfied for sure. External speaker is nice and loud, but, it's still a phone speaker. Call quality is fine (I think people that analyze phone quality are the same people that claim to be able to tell the minute differences between fine wines...can you really tell that much difference??? probably not). The notification light is on the front, not the side like ATT. It blinks green for MMS/email/calls and is red for charging (has a nice pulsing appearance to it too).
LTE speed here is excellent (22Mbs down 9Mbs up on one test).
Software: Minimal Sprint bloatware, which is nice. Some of the LG stuff is useful, some not. I like the LG NFC app. They include an NFC tag in the box with the phone. You can put that tag somewhere (say your office desk), then "Code" the phone to recognize that NFC care and instantly apply settings/open apps/URLs/etc. For example, you want your phone on silent and Bluetooth and WiFi turned on when you sit down at your desk. Stick that NFC chip on your desk set your phone on it when you sit down and -boom- all your settings are instantly changed. I hadn't thought of using NFC this way until now and think it's a beautiful implementation of the technology. You can order NFC tags and code as many as you want on your OG.
Overall, I'm very satisfied so far. I was really wanting a Nexus 4, but if an LTE version isn't coming to Sprint, that's a deal breaker for me. This phone is extrememly capable and beautiful. It'll likely get a strong developer following and get AOSP ports very soon if that's important for you (xda has already cracked the bootloader with a teathered solution).
I'm happy to answer any questions...
turtle