I've been using Sennheiser SK5012 transmitters paired with EK 3041 receivers because they're cheap on ebay. But it's old tech. Do they sound better than cheap current generation systems? Or is this the best bang for the buck? I'm guessing the analog amp circuitry is good since these were high end models, but that better transmission quality exists with newer digital radios.I have them paired with DPA 4060 lapel mics.I've also messed around with lectrosonics MM400 transmitter and CR210D Receiver. Also deals to be had on these. Seems like its wireless tech is newer. Not sure which is better. Besides audio quality, I'm interested in compact size, long battery life, and easily swapable batteries - so I can leave them on the subjects for hours at a time - until they forget they're there and act unselfconciously. Any thoughts / experiences much appreciated.