I switched to the U45 from the U4 because I was having some dropouts even within a few meters radius. There was no way for me to know which channels were receiving interference, so I basically had to test every single one, which was tiring.
The improvement I got from U45 was so great that I feel comfortable saying I no longer have that problem.
Even though it doesn’t show RF strength per channel, the autoscan feature works incredibly well. So far, I haven’t had a single dropout, and the build quality is top-notch. The belt clip, in particular, is far better than the flimsy clips you often find even on more expensive systems.
Another big plus is that hardly anyone uses the 5.8 GHz band, since most professionals stick to UHF. That means I basically have the whole 5.8 band to myself — and it’s been working flawlessly. ;)
I highly suggest it to everyone.