SPN has a maximum of 3 hops (same as Tor), unlike Proton, IVPN, Nord, etc that do a dual-VPN, multihop, whatever you want to call it, with only 2 hops.
I’ve added 2 additional hops via hardware network infra through VPN chaining and I still achieve upwards of 150mbps down on a 1gbps connection with a total of 5 hops. So, I feel the speed achieved considering so many hops is pretty amazing. Of course, depending on the locations routed, may have high ms ping.
Even if you just purchase 1 month, the worst case scenario is you’ve lost $8. The best case scenario is you’ve found your new fav open-source Linux network manager with an onion router like me.