This is one feature I really miss coming from a fully loaded previous vehicle. I have a bunch of keys and stuff attached to my car key ring as well and sometimes it is pain to have to fumble with the keys when you have to grab a bunch of other stuff out while opening the door. Even though I already have remote start with alarm installed, I have already contacted a local shop to see if it's possible to add a keyless push button start even though I already have remote start with alarm installed and they assured me they can.

Before I even seriously consider doing this; does anyone here have any experience with aftermarket KEYLESS push button starters?

I find the 'Advance Keys' system really cool. Haven't really been able to find any other mainstream brands though.

 

My Sonata was the first car I had that came with it. I love it. The new Outlander also came with it so that was a plus for us.
The OS had the spot for it on the dash, and I've seen some aftermarket alarm / remote start / push button start kits on Amazon and ebay. I think they were around 3-400+ for them. Factory proximity entry is nice, but I still like being able to lock/unlock from just pushing the button through my pocket and not having to have a hand full of keys hanging from the dash or column .