It's very similar in size to the 346/396xt, the pro-107 is just slightly taller. width and depth are about the same. The performance of my pro-107 is superb, nice crisp audio and a very nice easy to read display. It has a very clean squelch tail and it is very sensative in the receiving department. Side by side performance comparasion with the 107 against a 346xt, the 107 was the clear winner. Both had upgraded identical antennas, Watson W-801 and the 107 pulled in better signals and was chatting away while the 346xt was a second or two behind. I highly recommend an antenna upgrade as the stock 107 antenna is not very good, decent but a better antenna made a big difference. Im very happy with mine so far and not one problem. The lack of buttons on the front was an issue with me from the beginning, but the performance and technology quickly turned me around. I can't wait for the psr-700 to arrive, that will be my next purchase.