I'd love to see real life experiences too. Seem to be so many choices . . .
Have run with the discontinued older-style LEDs from Goff, which 'worked' but quite terrible beam patterns in the 2 cases I had (using a different reflector and glass on each to see if one was better than another. Wasn't.) And one 'filament' failed on both quite early.
Currently running 2 of the 12v latest version dual polarity ones from him, BPF fitment, and one older-style 6v BAP fitment. But it's very early days and it's not proper winter yet, so can't say anything yet about pitch dark riding. Meantime, I am running all lights on, all bikes, by day to see if they hang together before finding out the hard way at night if they don't. OK so far. If not happy, will revert to well-proven 45/40W tungsten/ halogen in Cibié unit on my most-used daily rider. A mate runs a Commando with an H4 LED - but he's not big on riding at night so is unable to say anything useful - except that it hasn't failed in daytime use either, which is a good start.
The www is full of all sorts, BPF, H4, sealed beam units, LEDs with fans on the back, LEDs without, diodes set all round the probe thing, diodes on 2 sides only, polarity sensitive and not. Really easy to get tied in knots. None are exactly cheap either. Plenty of You Tubes out there too, some by folk selling their idea of what's best.
Don't know if the ones Dynamo Regulator Conversions sell are the same as Paul G's or not. Not sure what the various things on e-bay are - same, better, worse or what? Nor whether it's a classic Q of getting what you pay for.
Not sure how long any of them last.
So, if anyone has done a couple of winters or more of regular riding, been able to see by night at semi-reasonable road speeds in unlit areas (and not had to replace them at the side of the road after a trouser-threatening blackout) be very interested to hear.