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Chris, I have an Neq6 and load an 8 inch newt + ED80 piggy backed. I get 10min subs guided no problem.
I am just about to purchase a HEQ5 for field work (star parties etc) and plan on loading a 6 inch newt (5kg) using an Off axis guider. I have recently read up on them and believe that I will get 10min subs also.
The recommended payload on a HEQ5 is up to 13.5 to 14kg - so I would be able to piggy back the ED80 on this also if I wanted.
I suggest that you ensure that you dont exceed the recommended load and keep it under too. Then, use the PEC function. I use PEMPRO software and it turned my EQ6 PEC from 15 arc sec of error Peak to Peak down to about 5 arc sec peak to peak! Then, good guiding will give you a reasonably round star at 10min if your are imaging at 1.25 arc sec and above. Obviously this is my experience only and others may have different experiences.
Bintel offer HEQ5 for $1199 or thereabouts. Andrews are doing them for $999. The difference being Bintel offer OEM warranty, whereas Andrews offers their own warranty only.
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