Review on Sennheiser Pro Audio EW 112P G4: Omni-directional Wireless Lavalier Microphone System for Superior Audio Quality by Shauna Kennedy

I did a lot of research before buying and there is a reason they come highly recommended. While I prefer an overhead mic, it's not always practical and that's where lavas come in. The sound quality is excellent, there is no interference, they are built like a tank. Yes, they're more expensive, but this thing lasts a long time, and there's a very good chance you won't have to upgrade or replace the device yourself later on.