I'm thinking about picking one of these up. (with oscillation and battery) From what I'm reading it seems people are generally happy with this unit. One point in particular I would like to hear users talk about though is ball speed. The "ejection" speed is listed as up to 60mph which doesn't sound particularly hard. Is that enough to simulate good shots at 4.0 level? I gather this unit doesn't have different spins, do users of this machine regret they don't have that option or is it not so important to you? Anything else insightful you might have to offer would be helpful, thanks.