Just my 2 cents. Long before Ron came out with the new metal links, people were adding the sway bar with out reports of broken links. Later in 2013, BRP had some bad links and there is even a notice about them and how to identify the bad links. I can see why Ron added the links to the bar for 2013 and up due to this bad link problem and users not knowing about it.
I have a 2011 RTS and put the bar on right away. While I have the metal links in hand, I just have not put them on yet. Needless to say, I have not broken my plastic links in 14,000 miles and lots of twisty roads riding 2 up.
With that said, I think you are OK with the plastic ones for your 2010 but if you want piece of mind, get the metal ones.
Bob