Received mine last Monday, started playing with it Tuesday, got a sim for it Wednesday.
I'll preface this by stating I'm coming from a 3 year old HTC Inspire 4g so if somethings seem "wrong" well it's light years difference between the Inspire and this Oppo Find 7a
My first suggestion would be to put the 2.0 beta on it, been running it since yesterday and so far I think it "feels" more stable than the 1.2.x that comes with the phone. Most importantly I haven't had a single SD issue since updating to 2.0b.
Sound/speakers are amazing. Granted I'm no audiophile but considering my other 2 devices, HTC Inspire 4g and HP Touchpad, this sounds night and day better than both.
Speed is blazing, again though I am coming from a 3 year old phone (single core).
Battery life is great for me even from the start. Even w/o comparing it to the abysmal life of my previous device I'd still consider this good.
No yellow tint for me so can't comment on that
The phone is light as heck and the size is great. I thought I'd have problems since I have such small hands but none to speak of.
Downside is no custom rom yet and as I'm used to CM the features and nomenclature are different and a bit annoying having to think about doing something where as I'm used to being able to just do it.
An annoying thing is the flip case that came with the preorder turns the screen on/off which seems like a great idea, it's just implemented wrong. When I put my phone in the cubby hole in my truck the screen turning on and off is distracting. I've read others are discovering it's turning on and off in their pockets too.
No LTE for me until I "backdoor" it since AT&T doesn't recognize this device. I registered it and got a new sim twice and my account still shows that I'm on my Inspire 4g. Granted I don't use a lot of data so not really a priority, but still would be nice to have it even if I don't use it all that much. Then again with the speed and battery life of this phone that might change.