I am very pleased so far with this product and the support I have received from the manufacturer.
I had ordered the 12000 btu. system. So far it has been working just fine. Due to the size of my shop I wish I had ordered the 18000 btu.
As far as a diy goes it was not that hard at all.
Of course if they had provided a little more detailed info about electrical hookup would have been nice.
For money involved and DIY hookup you just can't beat this system.