Banana plugs certainly can be very convenient. I ordered a few that were too skinny to fit well - very loose. Look out for the cheap ones - they can be a crap shoot.
Just in case you aren't aware: most speakers have a hole through the threaded post onto which those plastic connectors are screwed. You unscrew the plastic nuts far enough to insert your wire through the hole, then tighten. That usually makes a very tight connection (of course, if your cable wire is too thick to fit then you have several choices). Direct connection of bare wire isn't the easiest connector, but it does eliminate one extra metal-to-metal interface, leading many to believe it is the best connection.
