I bought a 660, then later an 880... I returned the 880 for a few reasons but kept the 660...
While working on my Father in Law's Icom 706 mobile setup, I was tuning around 20M, where I caught a ZL2 in Christchurch NZ... I pulled out the 660 & heard the same station, on the built in whip, at the same quality. He was running 800W...
It is my carry all when I am not willing to sling around the SDR setup with me. I carry 35' of wire on a fly fishing reel [for when needed]... All contained in fanny pack, along with some extra AAs...
It's a very compact SWL station & the 660 is truly impressive... I used to have a Sony 2010... I think the synch works better on the 660 & the radio doesn't cost you $400...
Well worth $100 IMHO
Enjoy!!!
Rafman