I've used only one
seedbox.io which I have it for 2 months now, got to 85MB/s download speed on one torrent, and upload wasn't that high on a single torrent, but still 70 MB/s, which I got to tell you is great, also I have no traffic limit, thats why some days I go nuts and get from 600gb-1tb traffic/day (its not my imagination )
The bad side of this one is: if you upload to a single person you do it to 700KB/s, top 1MB, but after that for every person added the speed gets higher with around 700KB/s, and ussually stays at 20-30MB/s depending on who you upload to.
The support is great from my point of view.
The seedbox goes sometimes down when I overload it, but only for 2-3 min.