JessEm makes two router lifts and both are well regarded. The Router-R-Lift II and the Master-R-Lift II
I am not a professional woodworker. I consider myself a mid level to advanced hobyist.

What would I miss if I bought the less expensive model over their top of the line?

I will need to get a router motor for it so compatability is not a huge factor. Ease of use, precision and durabilty and weight to smaller degree are important to me.
I will make my own custom top and fence system Adapted to my table saw.

So if someone is familiar with both I would appreciate your opinion.