Great sturdy product, needs 6cm overhang
It's an easy install and a soft pad to chill on. Our smallish junior female fits well, whereas our almost adult male needs q bit more legroom.
PLEASE NOTE: you need a min of 5.5cm overhang on your windowsill to attach the board properly and the screw is almost 12 cm long underneath, so check distance to radiator if you have one below the window.