Being a backtagger myself, I can say that I've generally had good experiences here. There are a few boomerangers, but even among those there are ones that will backtag for a good long time, and there are a few extremely good backtaggers that you can definitely rely on to not drop your thread for a good long while. Sure, some players aren't good at it, but I've found that it's easy to find those that you can rely on to backtag.