Not tried the Terrus, but for all its faults my LGV Comp Ultra is the only springer I didn't have to dick about with to get it shooting right. It's the one I pick up when I really want to hit stuff.
The best thing about getting a 54 Airking was that it made the LGV feel lightweight by comparison
I did fit a bipod to the 54 (thanks to TB), but I think it may need wheels instead...