I bought the PLRF10 for durability. If it can handle an Army guy running and fighting then its has to be good enough for me. I wish it had the digital compass but hey for the extra price.... I got a good deal on ebay for it. I'm sure the Terrapin will hold up and all. As far as the range finding ability, trying to range a small target is not easy for these devices. Just look at the difference your bullet drops between 625 yds and 675 yds. For my 308 its about 20". So if you miss range a small target and get the berm instead, then you're 20" off vertically. Between 725 yds and 775 yds, you'll be off by 33". Just my 2 cents.