They are dimmable and make plus the most pleasant light among LED spots. This is subjectively most closely approximates what the warm hue of halogen lamps rated of all I tested LED spots (Sebsons, ...). For this purpose they are very reasonably priced and so far I did not have a loss.
The only criticism would be the slight delay of about 1-2 sec., To which one is more used than the uncomfortable cold white light of other manufacturers.