I tried them about half a year ago for several months.....
The speeds were hit and miss (one day it'd max out my 30mbps, the next day it'd cap out at 20, hell, sometimes even 15). The biggest thing that seemed to make a difference was upping the raw "connection count" to whatever their max limit was. Changing ports/ssl etc. didn't seem to have much of an impact.
I can never be free, because the shackles I wear can't be touched or be seen.
i9-9900k, MSI MPG-Z390 Gaming Pro Carbon, 32GB DDR4 @ 3000, eVGA GTX 1080 DT, Samsung 970 EVO Plus nVME 1TB