Looks like one of these from Machine Mart.
http://www.machinemart.co.uk/shop/p...-cctqr-bike-trainer?da=1&TC=SRC-turbo+trainer
I don't have experience of this model, the only adverse thing I could note is the roller looks quite small diameter, the only problem with this is that if you brake hard it can burn the tyre as the roller spins in one place.
IMHO you don't need an adjustable turbo, just use your gears to vary the resistance. You can also screw up the roller a bit tighter to increase the load on fluid trainers.
One advantage of using a variable load is that you can get a finer adjustment if you are looking at speed as a reference. What I mean is if you have a low load, ride at 25mph, 24mph and 23mph say, then bumping up the load so you ride at 15mph and want to drop down to 14mph it's a bigger drop in load.
Nothing wrong with the cheaper turbos as long as they are stable, money is better spent on a computer with cadence and a heart rate monitor.