Here is a pic of the original track on my 08 Apex. I bought it used with approx. 3000 miles and studded the track with Stud Boy SuperLites. I too had the same concerns as you as this was my first rodeo using them and had always used either Woodys' Gold Diggers or Megabites with the traditional aluminum-plate-backer-tall-nut-stud combination. When I replaced the track, the sled had 13,000 miles on it so this is a real testament to how well those backers held up after 10,000 miles of use. I never experienced a tear thru like I had previously with the aluminium backers nor did I have any that came loose via the "plastic threads". I have since used these on the Nytro when it was a 121" and again when I added Star Suspension Relocation kit that called for a 128" track and now I also run them on my 18 Apex.
If/when purchasing the Stud Boy SuperLites double backers, be sure to get the ones that have a larger footprint (the bottoms of the backers are larger although the distance between the two stud holes remained the same) as they are meant for the single ply tracks but can be used on the double ply tracks like we use on our Yamahas. Since the 18 Apex used a 2.86 pitch track, this was a no brainer to use them on that track but when Ron (@ Stud Boy) informed me that I could also use them on my 2.52 pitch replacement track for my 08, I opted to go that route as well. There was no cost difference between them and thought the more square footage of the double backer was a good thing since they fit. The picture I posted earlier was the 2.86 pitch track on my 18 Apex. Here is a picture of the 2.52 pitch track on my 08 Apex.