It's a free firmware upgrade from an RC3 to the RC4, allowing clubs with an RC3 to upgrade and run Purcy transponders for zero outlay.
But there are lots of clubs still running the original AMBrc box (the original boxes with a working USB port and no Ethernet), which can't be upgraded via firmware. For these clubs its a £415 hardware upgrade, which a lot of them can't afford.
And until every club you race at has upgraded to an RC4 box/firmware, there's no point buying a Purcy transponder. I assume AMB/Mylaps will continue to make the Harry transponder for the forseeable future. If not there will be a lot of sales going MRTs way, as it's likely to be many years (decades?) before all clubs have switched to the RC4.
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