I think the Brewjacket may be the most space efficient device for fermentation temperature control. I agree fermentation temperature control is critical to success.
I have a GF. I like the small batch pipe works. Efficiency is a bit lower for small batches. But, I love that GF can easily do full and half batches.
I have but never use the hop spider. I don’t recommend that.
I have the GF graincoat insulation jacket. I have never gone without it. So, I can only assume it’s helpful. I have evidence.
I also have a Hot Rod from brewhardware.com. It helps speed temperature rise from mash to boil.
David Heath does lots of videos about GF. In the video at the link he discusses using a Robobrew false bottom to minimize pump blockage. My pump
Is a bit slow when filling the fermenter. I may try this eventually. But, so far, I am satisfied waiting a few extra minutes during transfer. https://youtu.be/dwUptHvFK78