I bought a 2002 GW 330 which was repowered with 2013 F300s - it came to me with Thunderbolt 15.5 x 17 .
Props seem to perform well - acceleration, bite, etc, is excellent. MPG is not stellar (1 mpg is about normal) and top speed is 41-42 on a good day. Holds plane best in 27-30 mph range...