Hi
I prefer the accuracy of rinsing with pencil jets. I have a Superlight Double trim which I converted from pencils to fan jets.
I find that to get a decent flow rate with fans you get spray everywhere.
In my experience, the only way of 'containing' that spray is to rinse on the glass; which I'm not a 'fan' of. If I reduce the flow to stop the spray, rinsing the glass takes too long.
I will probably try Gardiners new fan jets when they come out and see if they are any better.
I agree with Jeff, it's a matter of personal preference. I also think that if you try them, you need to stick with them for an extended period of time to adapt to them and not just for a couple of windows. Also remember that with current fans on offer, you need to drill a 12mm hole in your brush for each jet. If you don't like them, you are left with the holes.
Spruce