I also think the verdict is in. I have an 18 RTL. I have a lot of money, pain, and time invested into that bike, and other than some design changes, not to offend any of my fellow Spyder riders, I think most of the issues and shortcomings with these earlier production bikes kind of followed the new machines as well. So, if that means that much more money just to get a newer machine and then start all over, I'm not sure that would really be worth the time or the expense. If BRP really rolled out some fire breathing, rock solid machine that you JUST HAD TO HAVE, then that might more sense, I think.
My bike is not that old, but it is certainly not new, and there are some additional toys I would like to add to it. What I know is that I still love riding this bike when I get onto it; everything fits, it's all comfortable, and it works kinda like my favorite WSU sweatshirt. It might have a hole or two, or a grease spot here & there, but it's comfy, and sometimes it's just too much work to break in another.
Whatever you decide, it will be a Spyder, so you can't go too wrong...