We needed a built in wardrobe for the main bedroom. I got 4 quotes. Perfect Australian Wardrobes were by far the cheapest - the next quote up was more than a thousand dollars more and the highest quote was a ridiculous $2500+ more than Perfect Australian Wardrobes. The other company reps. seemed very business-like and 'warned' me about some other companies who weren't professional... but the sales rep for Perfect Aust. was relaxed and thorough.
All my worries about taking the cheapest quote were unfounded. The wardrobe which was finished last week - is great. A great finish (admittedly a different door finish than the other companies) - which matches the room and looks smart.
I've had no problems at all with their service which was prompt.
I think with the other companies you're paying extra for their well-established name. I'm seriously considering having another wardrobe done.
One more thing - for the other companies I had to wait much longer for someone to come and quote. Perfect Aust. Wardrobes were around in no time - and when I accepted the quote - they offered an installation date of only a few days away.