We've had 2 powered ones over the years off free cycle and they've both died. Having googled I don't think I could stretch to a brand new electric one. I love the one in the gym (the belt is super cushioned and I can run/jog comfortably for ages at up to 10kmh) but having looked I can see it cost almost as much as my car 
Have seen manual ones which are obvs much cheaper but not sure what weight of person or speed they can handle (suspect at 89kg I'm at/over the top end of the range for ours which is why they died
).
Anyone got any experience? Btw I have anxiety which is currently pretty crippling so not able to run outside much, hence wanting the treadmill. Am aware I could run outside for free but unfortunately it's not quite that simple.