Not to beat a horse, but I did a SINGLE 10 minute exposure on Eta Carinae last night, with the Starshot set to refresh every 0.5s. Did not beep once all night. Even did a 20 minute sub as a test - NO star trailing, perfect images (except light pollution orange cast).
Here is a 100% unprocessed shot of Eta Carinae, using unmodded Canon 5DMkII, single 10 minute sub. Only cropped to show a target area.
http://img7.imageshack.us/img7/2531/closeupcore.png
Your results may vary, as it seems it does with others, but I am happy getting 10 and 20 minute single subs without any noticeable trailing or oblongaton/elongation.
