When I moved into my current place 5 years ago a lot of the lighting was 12V MR16 halogen bulbs. I replaced most of them with high CRI Philips Master LEDspots (specifically marketed as having a longer lifetime aimed at commercial installations but they weren't significantly more expensive vs "consumer" versions at the time if you were looking for high CRI anyway) and kept the transformers in place. I've had one fail out of probably 50 or so bulbs in that time, which feels about par for the course to me.