I think pressure bleeders are fantastic and they are very easy to use. For years I used the Gunson easy bleed... A pain because you have to use a tyre/wheel to provide the air pressure and so you have to have a tyre with a pressure of no more than 20 psi. How ever the volume means you don't have to recharge the pressure as you flush the system. I have since moved up to a far more sophisticated system which is much simpler to use and you can store your reservoir fluid in the tank safely without emptying, so cleaner to use! But the temu option is good for occasional use and if you look around it's being marketed for anything up to £100 from varying outlets!
The biggest tip I would suggest when using these systems is to first check the pressure patency of the system when connected and pressurised with the reservoir empty. If you have a leak it will be obvious and you won't squirt brake fluid everywhere. When satisfied you can depressurise and fill the reservoir to start your required work.
As Dave said .... the caps supplied are rubbish, you might be lucky but I never have been, so get a proper replacement cap and make your own using the coupling supplied with the set.
When you have finished and depressurised the system carefully remover the cap, Don't panic you won't have fluid running everywhere. It will be full to the top but won't overflow. I then use a standard 20ml syringe a couple of times to lower the level to accept the level sensor of the vehicle cap.
Once you've mastered this method of bleeding you wont go back to shouting at the wife..... promise.
