Don't bother! I was looking at getting a second hand one, but they hold their value really well. I looked at loads and most had been abused, done millions of km, were many years old, creaked etc and were going for not much less than a brand new one. Ergs in reasonable condition, some still with the old PM3, were still going for around £200 less than a new one. I ended up saving up a bit more, biting the bullet and grabbing a brand new one from C2. It was £860 but that had a full warranty and PM5. I figured if I didn't use it much I could lump it on eBay and I'd still get most of what I paid for it back. I'm going to do another cycle on the plan I'm on then try and really push my 2k and 5k. I really want to get sub 7 on the 2k, "only" 7secs to knock off. I could definitely go faster on the 5km too as I didn't feel like I was going to die when I finished!