They are a great no nonsence rest. Simple, rugged and reliable.
They accomplish the same thing as a drop away but do it in a completely opposite way. Where as a drop away gets out of the way to eleminate fletching contact all together the WB grabs all three vanes equally thus eleminating the kick off you would get with shoot thru prong rests.
Personally I am a drop away fan but the WB is an excelent rest. I will very likely be equiping my daughters and wifes new bows with WB's.
AS far as which one to buy.... I would spend the extra money and the the deluxe quick shot version so you can make small vertical and horrizontal adjustments.