What is your opinion on using locking vs. standard banana plugs? I'm going to be wiring a complete 5.1 system soon and will need to purchase a lot of plugs. I'll be using "bannana plug wall plates" behind the AV equipment rack and at the subwoofer speaker locations. I like the concept of the locking plugs but not the price. I've used standard ones for years and never had a problem. What is your opinion regarding the locking plugs being worth the premium in price?