I have a 2008 Ridgeline RTL that I bought new in 2007 which now has about 135K miles. I keep to the regular service schedule and it has been 100% reliable. The only issue I can think of is when it hasn't started due to a dead battery, but this is something that every vehicle is subject to. My batteries have typically lasted about 5 years (I'm in SE PA). The body has held up exceptionally well as had the interior. I'm on only my 2nd set of tires (Michelins) and may have another 10k of tread available before needing to be replaced.
The RTL has leather seating and satellite radio. Not sure whether or not the RTS was available with leather. If leather doesn't matter, you could go with RTS unless you must have sat radio. I am very pleased with my 2008 Ridgeline and plan to keep it around for at least a few more years unless something catastrophic happen with it.