Hi,
Found this post on Google and felt the need to register here an chime in with my experiences, so hello everyone!
I have replaced a bunch of filament bulbs on my motorcycle (Yamaha YBR125) with LED equivelants that have the same fittings. I ride all year round, 60 miles a day commuting, and through winter that means the ride home is always in complete darkness along some unlit roads, so I really don't want any of my bulbs to fail, hence why I went for LEDs. Also, a busy family life means I spend less time faffing about with bulb changing. Overall, I'm extremely happy with these bulbs. I should also put that it's important to use white LEDs if you're putting the bulb behind a coloured lens.
4 x BA15S for indicators, replaced with white 24 LED emitters. The original bulbs were 10w each. A few of the LEDs face sideways and help light up the reflector. Just as bright, if not a bit brighter than filament bulbs and visible at any angle, when I compared them. Very fast response time as noted from another member above. I needed to purchase a new flasher relay that could cope with them, because the old types rely on the high current draw to operate.
A bunch of T10 and T6.5 wedge fitment bulbs for the instrument cluster (dashboard for car drivers!). These backlight the clocks and warning/indicator lights very nicely indeed. Replaced a lot of 1.7/3W bulbs and have proven not to be distracting at night although brighter.
A T10/501 warm white SMD wedge jobbie for the 'aux'/side light in the headlamp shell, which replaced a 5W filament thing that blew often. Matches the colour of my headlight beam nicely (although has no impact on it when headlight is on).
A BA15D 21/5W replacement for the rear/brake light. In white, as it's behind a red lens although there's a clear section of it where the light illuminates the number plate.
The only bulb that is still filament is the halogen 35/35 BA20D which is the headlight, and that's because I'm unsure of the legality of using an LED as a main headlamp in the UK (I think it's illegal). Regarding the legality of the other bulbs, I believe there is no problem as it is the lenses that have the E mark and such.
So overall I've cut around 15-20W of power usage during normal running, peaking to around 60w if I have the indicators on and am breaking (or 'peak' usage, perhaps). On a small bike like this it makes a difference - braking or indicating would make the headlight dim slightly with the old bulbs due to the extra strain on the generator, now it's fine.
Hope this helps.