Is Grundy a decent insurance company for classics?

I might get some hate, I might not, but I'm looking to register my 91 Nissan 240sx (It hasn't had an engine in 8 years, and I *might* take it to the gas station here and there)

But I just got quotes from both Grundy and Hagerty. Hagerty was $640/yr, whereas Grundy was $125/yr.

It feels almost too cheap to be true. Has anyone used them? Any issues? Just a rusty.... LS swapped 240sx. :P