I currently have a 3pm (at least 7 years old) and I'm considering a 4pkr-s. It stands to reason that the 4pks-r would be faster but I haven't been able to find any info on the interweb. Does any one have any info or personal experience to help me out?

Thanks in advance!

Mostly depends on the receiver. This this previous thread:
http://www.rctech.net/forum/radio-el...l-4pks-16.html

Excellent info, thank you. I'm still curious about the response times
of the 603fs /4pks-r. Would they be lower because of the high end radio or would they stay the same because of older tech receivers?

I would guess that they are the same response time in 'c1' mode.

The 4pk has a 'c2' mode that is faster.



There are hk c2 compatible RXs

I recently switched to a 4pksr, and initially used the 603FS/FF receivers as that's what I had, and made no difference to response times over the old 3PM radio. I could feel the difference when I switched to 614FF-E receivers, it was noticeably quicker in response times.

Thank you for sharing your hands on experience! Just the kind of info i was hoping for.