I found installation and initial sales process to be good... HOWEVER, as others have indicated the customer service is apalling!! They promise to send the forms required to get approval to connect to the grid ...but don't send them. (I've installed more than once with this company with exactly the same result). If you chase and chase you'll eventually get sent blank forms to fill out yourself and return to the grid connection department. This department will reject your forms saying YOU sent them the wrong forms - even though you are returning what was sent to you. You'll then be instructed to call the electricity company yourself to arrange forms,
The sales team will tell you that you'll have all the forms submitted within 48 hours. Please assume it'll take a month and you'll end up doing it all yourself. Then the approval process starts. Assume that due to the terrible service it'll take up to 2 months for installation.
Also, don't assume that they'll arrange your Interest Free Finance for you (like Harvey Norman or others do). You have to arrange the finance by yourself ... but don't expect them to actually tell you this...you'll figure it out when you call and call to find out why you've heard nothing and they ask you... did you arrange your own finance yet ?
Once you get through the frustration of the applications etc you'll find they do a god job installing and the systems work well.