I bought a set of Stromer branded suntour forks. I like them better than my carbon forks.
They have held their air pressure for weeks now, the sag has remained the same, and although they likely don't rebound as crisp as fox or rock shocks, they don't feel mushy- I am very satisfied with them. As I am with BOTH my sti step-thrus. I vary my tire pressure, but agree low tire pressure- better ride(but more pedaling effort. Thud buster and these forks- higher tire pressure makes things just about perfect.
I think for road use a Suntour is pretty equal to the better (for off road) forks.
From many years of riding unassisted and playing with tire pressures a lot, I'd wager the increased pedaling effort to be a lot less effect than most think. It feels like it, but the speedo doesn't agree with the tires I use. Especially the balloon tires now. Big Apples and Bens are pretty dang amazing, to cushion like they do and be as fast as they are.
With peddle assist why would very slight tire drag be a concern anyway? it's tiny in amount of energy used relative to battery.
And way less than you lose bobbing on the fork, even locked out.
If I had bought new I would likely have chosen the suspension, I have motorcycles and it does make sense.
That said, I am THRILLED with the amazingly compliant ride of my ST1 with that carbon fiber fork flexing and dropping the psi to 40 and wouldn't change it for a suspension fork now for free, especially knowing it's faster.