There's quite a big gap in price between the quasi professional meters and the low range professional meters, then an even larger gap between the low range and top. The only reason I'd sell my Promax Ranger HD plus would be if it no longer did what was required, or there was a significant development in the newer models, it's probably similar for other installers, so don't expect to see a flood of secondhand ones, or units around the £1,000 mark.