I'd say the Maven C3's are definitely worth the extra money. I have used the Tiogas and own the maven C.1 12x42. I wouldn't really even put them close. Honestly, I've had better views in a vortex diamondback or crossfire than the tiogas. If you wanted to save even a little more money off the C.3s go with the 12x42 C.1s. I know everybody worries about the lower exit pupil and low light performance, but in real world application you are not losing much low light glassing, if at all. I have ran them against 12x50s and its mere seconds of low light glassing time, but you are gaining a lighter and smaller bino at a lower price. The exit pupil on a 12x42 is still bigger than the 18x56 binos that everybody is so high on these days. Just a thought!
I love my 12x42s and can't say enough good about them for the price.