The rinse brushes are only going to work if you have a decent flow of water. You won't get enough water using microbore hose or if you connect hoses with fittings that reduce the water flow like EZ snap.
I use 12 mm flat hose joined to 10mm pole hose fitted a 10mm pneumatic tap/valve to get a decent flow at the brush head to give plenty of rinse so it makes the difference required.
The brushes set up this way give plenty of flow at the brush head. When the brush is turned vertically the rinse ahead of the brush drops to the front of the front row of bristles owing to gravity so it's easy enough to keep the water directed where you want it to go and not above so as to avoid bringing dirt down from above. In my opinion Reach-it overcome all the problems of the previous versions of the constructor brush thus allowing a quicker and more efficient clean using the technique they recommend.
I was cautious and bought one, the 'Radial' to give it a try, wasn't getting enough water even with the pump cranked up high so changed the hose and fittings and then noticed the vast difference in water flow which is the key to making this brush perform how it should. Took a while to get use to the technique and now I use it all the time even on windows with vents above as I can avoid putting water near the vents.
Then I bought the 'Lite' version which is much lighter but doesn't have two rows of radial brushes and the bristles are shorter but still a good brush.
There is one fault with the brush which I told Reach-it about is the swivel is set at 15 degrees to allow the brush to remain flat on the glass for perfect agitation which is good for working up close but on the Radial lite with the shorter bristles it really needs a longer gooseneck fitted which I've had to do myself whilst keeping the 15 degree swivel it attaches to for working on windows with deeper sills.
