They fit the light fittings just fine. 1-nil to the bulb.
They actually radiate quite a lot instead of delivering light down on the surface which incandescent spots illuminate. 1-1 a draw.
They are only available in the UK (as far as I can find) as warm light (2700K). 1-2 against.
They take a moment to warm up to full brightness. So what - still 1-2 against.
The only available wattage I could find at a reasonable price was about £6 for an R50 and £8 for an R63 all plus postage. The effect of this wattage limitation comes when seeing the illumination. The Megaman brochure says a 2 or 3 watt brighter bulb is manufactured in each size, but I could see nowhere to buy these. So the illumination was not as stated a direct replacement. 1-3 against.
The specs say the bulbs are good for 600,000 off/on cycles. Great to know. And they are claimed to outlast their incandescent replacement by 15 times (15,000 hours). I cannot tell yet and experience shows the old spots hardly did a few hundred hours, but 2-3 against so far.
The Megaman bulbs look VERY well constructed compared to some cut-price spots we have used over the years. 3-3, a draw again.
I have to take out the dimmer switches and replace with on/off. I still have the original switches, so no cost there, still 3-3.
Trying out in a room with bright (whitish) paint is markedly better than wood panelling which soaks up the warm light.
It feels good that 1/4 or less electricity is being burned but the effect is not what we installed all those years ago. Maybe it is time to re-design some of our lighting.
I will probably wait for prices to reduce to make a big spending surge on this front.