For me the v4 switch is every bit as nice as the v2.5 lux switch. Very short and soft throw. At 99 EUR, good exchange rates to the USD and terrific DHL shipping it's a bit of a no-brainer.
How do the switches on the later Paps compare to that of the older Lux? The Lux has the best switch in mod history IMO. My most regretted sale ever...