Initially I chose the Mark Group as their salesperson was very helpful & responsive and I liked the idea of the 'backing of a large company'.
Installation happened VERY quickly ... was a little more expensive as the switchboard needed replacing, but I liked the safety aspect of everything being 'overhauled'.
BUT a few weeks after installation we had a total power failure which ended up requiring a Powercor callout to replace the Main fuse ... the one at the eaves that the installers had to have removed several times during the installation of the system & replacement of the switchboard. The linesman said it was so old & corroded that we were lucky it hadn't caused a fire ... I would have expected that the 'Mark Group' installer should have noticed this & perhaps given us notice & we may have been able to avoid the $600 odd call-out fee.
THEN
Early in February I noticed on my inside meter that although it was a sunny day & no one else was home, there was no power generation ... Checked outside & sure enough the Inverter was dead. Tried all of the recommended steps to restart but no go ... then my nightmare started.

Getting through to the Mark Group was nigh on impossible ... Each time I was told an email would be sent to the Service department and I'd be called that afternoon or the next day - but it didn't happen. I tried calling State & National branches, faxing, emailing even sending a fax to the National Office addressed to the CEO ... NO RESPONSE AT ALL.

A week later I had a heated discussion with some poor receptionist and she was able to get someone from the Service Department to call me (albeit a day later than promised) and by Friday a team called in after an installation in the area & replaced a faulty isolator on the roof.

The moral of my story ... bigger may not be better! If I were the CEO of a the Australian branch of a worldwide organization I would certainly react in some fashion to a fax addressed to me personally - it should never have escalated to that level BUT it appears that the Mark Group have POOR after sales service & little to no local support ... you have to wait until an installation team happens to be in your area.

I doubt I would have had the same indifferent service from a LOCAL installer.

Approximate cost: $10,000

Signed me up with a new provider promising better Extras cover - 'unlimited dental' ... missed the small print it was unlimited 'preventative dental' so I've ended up probably worse off than before I used their service - think I'll research anew Health Fund myself this time!!