The 'give it a try' method
The first way to ask for the buying decision is the simplest of all. You say, "Well then, why don't you give it/us a try?"
Source: Sales speaker/author Brian Tracy
This is one of the most disarmingly effective closing techniques. It sounds so simple, doesn't it? Phrasing the decision as "giving the product a chance" instead of "making a commitment" downplays the risk and ramps up the rapport.