BMI used to be quite good, but I must confess that I least used a redemption ticket about 2 years ago with them. Since then I have (unsuccessfully) tried to redeem on several occasions and would echo the comments of poor service and availability that have already been posted.
Does anyone have experience of Lufthansa? As it looks like they will be buying BMI the Diamond Club may be set to become Miles and Miles soon.
Either that or my wife and I have 2 million+ bmi miles to spend very quickly!!