Love the Senator Sixties. It's got just the right touch of retro-whimsy in the typeface of the numerals without going full-on Franck Muller. I like to think about how much time G.O. executives spent considering and debating typefaces before settling on the sweeping, almost-calligraphic, numerals they ultimately chose.
I do like many of the brand's pieces, particularly the off-beat PanoMaticLunar, though I can see how - as Mimo says - some of the designs most certainly seem A Lange-derived. But that's hardly a deal breaker for many. Watch companies often riff off of each others' designs ad nauseam.
The name recognition certainly isn't there with G.O. like many brands, though I find that watch aficionados generally respect the choice as one that demonstrates character. I tend to think of G.O. as a great value and an excellent non-Swiss choice that flies under the radar of most while delivering unmistakeable quality and refinement.