I really wish that Synta would migrate the Atlas/HEQ-6 mounts over to a Celestron Nexstar firmware clone. Synscan simply isn't as mature or reliable. Why support two completely different firmware families when you own them both? Nexstar also has one valuable (to me) feature that Synscan lacks - the "Slew to RA and Dec" feature. This is a godsend for double star and variable star work beyond the teeny onboard double star and variable star catalogs. I end up using the User Defined Object feature in Synscan, but that's many more keystrokes, requires separate record keeping to identify what object has been assigned to each slot, and limits you to 25 targets at a time.
Beyond firmware issues, however, I've really enjoyed the Atlas and have used it ALOT without incident.
Dunno why they stick with two systems. Anyhoo, the new Celestron CGEM is basically an Atlas/EQ6 prettied up.