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I have not purchased from them, and looking at the controller pictures they post I would not purchase them because:

1. They look like a re-badged Kelly.

2. The photo shows a LINEAR IGBT / MOSFET array instead of pair of IGBT per channel. The Kelly controller reliability issues are related to the fact they do not use QED modeling for there array and does a simple linear layout as the photos on Lowcarbons website show in their (demo?) controller, so I would expect them to have same reliability issues.

I would give them a shot:
If they are willing to put a multiyear warranty in writing.
If they would sign a contact stating arrays are not used or are properly modeled.
If they are cheap enough that I could afford to burn the cash.
 
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