I've got a cyclops fluid one- it's fine.
I'm not a great fan but its a useful way of getting some aerobic fitness in the winter.
I tend to use mine when its snowing / on dark evenings - although I'd rather do any other type of aerobic exercise instead. So its generally a last resort for me.
Get a front wheel riser or use some old wood to elevate the front - otherwise the positioning feels wrong & get set up with a stereo to pass the time.