Not sure why they sell Goop under all these different labels- it's all the same stuff.  But the good news is that Goop is a really useful adhesive.  It's strong and easy to remove off of smooth surfaces.  I use Goop on my race motorcycle to keep nuts and bolts from getting lose.  Unlike RTV, Goop is easy to remove with a pair of pilers. However, unlike RTV, it doesn't stand up to high temperatures as well, so I can't use it on the nuts which keep my exhaust headers in place.  But Goop works just fine for just about everything else.