Paul,
I have a Leica Disto D5. The prices listed for it on the internet are a good bit higher than what sellers will quote you if asked. Leica does not allow them to advertise lower prices.
The maximum distance it will measure is 200m and that is a hard limit due, I think, to their algorithm rather than not being able to receive the returning laser signal. It will give very accurate measurements at 198m, but if you move back 4m it will tell you the target is too far away.
Sunny days seem to have very little effect on the device's ability to work, but it can make confirming a hit on the target more difficult. By the way, reflectors or reflective tape is not necessary for the device to work. It works fine with any smooth, flat target even at 200m. The reflectors are only necessary at long distances to confirm that you are hitting the target.