I had a Terrapin as part of the Exploration Pack that contained a Carrack & several other ships, but I upgraded it into either a Polaris or Perseus since I picked up that pack. Most likely the Polaris, so no regrets. I'm sure that I'll end up with another little tortoise eventually.
I've held on to one for a long time, but have 4 or 5 different CCU's on hand to upgrade with should it underperform in it's job. With the Radar and Scanner being combined into one unit (and a replaceable module) the hull itself is going to need to have bonuses to scanning to make keeping it worthwhile over something like a DUR, a Zeus ES, or a 400i. Or a Drake Cutter Scout, which is about 1/5th the price.
Right now it's not fitted with the claimed size 2 Radar, so it's underperforming even in the current placeholder system. Armor is not in yet, Heat Management is underdeveloped, and the signature system is being overhauled with a new 'delta' value being added. So the Terriblepin has a lot of hurdles ahead to be worth that high $$$ price point and not become something more worthwhile.