I used to think car mounts were silly and served no purpose. I toss my phone on the seat next to me or in a cup holder and never touch it again until im done driving. I purchased a generic holder just for Ss n Gs and it confirmed my thought.
When i got my photon i decided to buy the OEM car dock and that has completely changed my mind. OEMs usually have a proprietary car home UI, which people can launch when in the car. But if you buy an OEM dock, in the case of moto, the dock auto launches car home UI. To add even more function i setup a tasker profile that when it detects car home, it turns on bluetooth and launches iheartradio. It's seemless and smooth. If an OEM dock offers added function like the moto dock did, I'll be sticking with OEM. Anyone can make a NFC tag to fix this so any dock would launch it but what a PITA.
The downfall being OEM docks are device specific so a new device means a new dock but 2 years is a good run for a $30-$50 purchase. Also i learned that some companies can get OEM accessories prior to them being put in retail packaging, selling them at a significant savings when you buy simply because the accessory is in a manufacturer bag and not a retail box. I picked up my HD dock and car dock like this and their combined cost with shipping was less than the hd dock MSRP alone and both were 100% brand new no issues.
One company that does this is
incredicell but use them with caution or search alternatives because last i heard their checkout/transaction process wasn't secured.