I have not used my wipers on my '07 Essex much at all since new. But, I have experienced three failures. Newmar was good enough to replace the entire assemble last year. I can guess I had about 8 operating hours on them and the right one failed again.
They are using a new design now and apparently not experiencing any issues. The new design, however has a different hole spacing as well as a diffentent plug interface. Having them replaced then requires body body and paint work to repair the old hole(s).
I've had it with mine. They are not reliable so I had them replaced with these new type. I have not yet used them as the coach is still at Newmar. I'm picking it up early next week and the weather looks like no rain. I will, however, pass on how they work in the future. I'm hoping they work great.
Peter