I generally don't like treadmills because they don't work your hamstrings like normal running would (people usually let the belt carry their foot backwards, which is cheating yourself), but sometimes you need one because of the weather outside and a manual treadmill in my opinion is your best bet. Because it's all moved by your muscles, your hamstrings at least get some use.

I bought this treadmill because of the weight tolerance and the belt size which allows me to run and walk.

Yeah, there's some belt wobble, but you get that with any manual. Just gotta fine-adjust it to your rhythm.

I'm not a sprinter--I prefer to "go the distance" and ride this thing for an hour at a time! I don't like the incline--even adjusted down it forces you to run fast (which, like I said, cheats your hamstrings because they don't get a good workout). Because of the size of the base of the handlebar assembly, there tends to be wobble. The wobble gets worse if you're positioned lower down on the belt assembly.

I compensated for this by putting weights at the tail end of the belt assembly, which lowered the incline. So now I'm more able to work out my hamstrings and keep my body position more forward on the belt which greatly reduces wobble. Having done that, I'm able to go for a nice jog for an hour and work out both my thighs and hamstrings.
Buy Folding Stamina InMotion® II Treadmill!