I bought a Singer Heavy Duty 4411 recently that's been working well. Have a few friends using it as well, no complaints from anyone.
I agree that an old machine is a better bet, but make sure you buy it properly serviced. I've picked up two duds that were basically completely bunged up with dried up grease.
If you are buying a serviced one, from someone with a decent history, go for it. That seller you linked has a brick and mortar shop, so probably reliable.
*Although they can fuck off with their "£2 Cottons" as thats £2 for 25cm.
I bought a Singer Heavy Duty 4411 recently that's been working well. Have a few friends using it as well, no complaints from anyone.
I agree that an old machine is a better bet, but make sure you buy it properly serviced. I've picked up two duds that were basically completely bunged up with dried up grease.