"I have a dozen of these lighting a basement hallway and utility room, and am very happy with them. Their advertised luminous efficiency (62.5 lm/W) is better than most LED MR16s, even the more expensive ones, and this appears to be borne out in practice. They look a little brighter than both the 35 W halogens that they replaced and other LED MR16 bulbs of the same wattage installed in the same room.
To my eyes, the colour temperature seems a little lower than the advertised 2700 K, i.e. the light is slightly yellower than I was expecting. It's a nice warm, relaxing light which is absolutely fine for general purpose room lighting, but I would suggest not getting these bulbs for lighting rooms where you'll be doing detailed work (e.g. a study or kitchen).
The other benefit (common to all LED bulbs) is the lack of downwards reflected heat. This was particularly important to me as my basement ceilings are only 5-10 cm above my head and the heat from a halogen MR16 hurts if you happen to be standing directly under one at close range! :)"