Dave
Just drove to Staines.
My Thor (is bigger than the Zeta) is heavy - 200 kilos but they are on pneumatic tyres and I have two scaffold planks cut in half to push/pull it into the van. I can do it on my own but the last time I slipped on the wet van floor and fell over.
I think you are paying for a similar level machine as the Zeta, I don't think it is much more. You are getting hour clock, Z1 unloader, they are a better put together machine and a lot sturdier.
Its Honda - should be bulletproof and shouldn't let you down - ever but if I was spending three grand I would have a drain jetter and make it suit my purpose. There are a lot of variables, what flow do you want each man to have, how much room have you got, are you leaving it in the van, will you really be pushing the service and expecting daily activity from the machine???
For me bigger is better and I buy for kit to not let me down, when I need it
Rob