I have one, but use the traditional method on a bike. I find the pump just sucks air in through the threads of the bleed nipple. The instructions say to put some grease on the nipple, but it just seems like a chew on tbh.
you can do all sorts of diagnostics with these too. http://www.tools4trade.co.uk/sealey...MI5IiG_aqT3gIV7ZTtCh1jXAJIEAYYASABEgKS7_D_BwE