I’ve never owned a Brinsea plate, I only knew that they weren’t rated for temps below 50, people complain about shoddy construction, and there have been instances of them starting fires. Thank you for your comprehensive review!Construction - The Brinsea is cheaply made and falls apart easily. Both of mine had the bottom plate fall off, exposing the heating element. I crazy glued it back on, but it was only glued to begin with. The Premier is much sturdier and put together with screws. Looking and feeling you can tell the difference in quality.
The Power Cord - The Brinsea cord is very thin and has a power supply plug box that takes up space in the outlet. The Premier has a regular size cord and plugs in with a regular plug. It is much sturdier.
Price - Brinsea is overpriced (for everything they sell) in my opinion. The Premier costs less and is better quality.
Cleaning - The Brinsea is a nightmare to clean. To do it right you have to take it apart and I always worry that the thin plastic will snap as I struggle to get the sides loose. Because they like to stand on top of it the poop gathers in the letters of the embossed logo on top and you will find yourself trying to pry it out with a toothbrush without getting the inside wet. The Premier is simple to take apart and clean with the leg design and with the cover there isn't much to clean off that a damp cloth won't handle.
Height Adjustment - Total struggle with Brinsea and can only be done in preset heights. Not helpful with different sized chicks. The Premier takes a few seconds and can be set on a slant to accommodate different sized chicks.
The Chicks - Seem to like the Premier better and don't get caught up against the legs like they do with the Brinsea. As they get less dependent on the heat they like to sleep around the outside edges with their little butts just underneath. With the more open design it is easier for them to adjust to their own comfort.