I have the Angler 2 because that's what my LQS had. It's pretty easy to remove to change a bobbin. Just lift up the tape you used to position it, leaving it taped in the back. Then when done, just lay it down and press down the tape. The tape in the back keeps it properly positioned.
However...if I could do it all over again, I'd buy the Clearly Perfect because it doesn't require tape - it's a vinyl cling.