I went through the same thing a few weeks ago. Here's my review I posted on some other forums (as I don't know if linking to other Ram forums are allowed). I've now had this system on the truck for about two weeks and it's rock solid.
I picked up my 1500 Laramie about three weeks ago and one of the features it didn't have was ParkSense so I've been looking to install an aftermarket system ever since. I do have the reverse camera but have had the audible sensors on my last four cars and gotten used to it.
After searching the web I was only able to find one single manufacturer that sells chrome sensors and that is Steelmate. Problem was that Steelmate have had some manufacturing problems at their factory and you can't get hold of their front/rear kits anywhere. Trying my luck I ordered another kit that looked similar based on pictures which was the Crimestopper CA-5020 from Amazon and the chrome sensors from another vendor (part #SM-CHRKIT2). Turns out that once I get the Crimestopper kit *it is* a Steelmate kit with a Crimestopper sticker. The actual Steelmate part # is PTS800V8 which strangely enough is not available on their US site, only their Hong Kong site. To cut a long story short, it worked perfectly with the chrome sensors, couldn't be happier.
I had it installed by a car audio shop here in San Diego and it took them about 3 hours to do. They had to extend the cables to the rear of the truck as they weren't long enough but it's normal RCA cables so easy to do. The rear sensors activate when you switch to Reverse and the front sensors activate when you hit the brake pedal. When you switch to Reverse the display will always light up but when you hit the brakes the display only light up if you're 3 feet or closer to an object in front of you. All other times the display remains off which was one of the concerns I had considering the placement of the display. When the system is activated it both beeps and a lady voice say "6 feet", "2 feet" and "Park!". The last picture is how close I was to the wall when she announced "Park".
Overall it works just like I had hoped and looks as good as the factory install in my opinion. Total cost was about $300 ($160 for the system and $140 for the 8 chrome sensors) + the install itself for which I paid about $250.