Some of my astro-friends are using Dwarf-2.. very happy with that.
This thing has 50 mm aperture and 250 mm FL (vs Dwarf 24mm 100 mm FL).. so it must be better as far as resolution is concerned.
And it is cheaper that Dwarf2 (in EU..). It seems the sensor can be upgraded by user...
Must be great for patrolling the sky (for transients..).. but not really wide FOV..