I have had several Leicas & the Swaro laser guide.
After talking to a few guys I got a PLRF10 before the Terrapin came out.
Their performance is on another planet to the "normal" rangefinders.
Granted they cost a lot more but side by side performance will instantly show you why
I haven't used the Terrapin but the 10 is incredible.
I still use the CRF1600 & HD Geovids, but when the ranging gets "difficult" the PLRF10 will save the day