leaks should be basically impossible. at the roof it a big 1 piece plastic flashing that sits about 5" above the roofing at it's lowest point. The dome sits on that with an overhang of about an inch. A gasket on the dome fits between the two helping stop air movement. If you installed the roof around it correctly it won't leak any worse then the chances of a vent leaking which is basically zero.
On the bottom there is also a gasket to help with condensation and air movement. You also tape every joint to keep bugs out so that should help. We noticed a bit of condensation in the tube of the bathroom at the old house but it went away each day and came back each night only in winter. Nothing you'd notice unless looking for it though. During the summer it was never seen and I was looking.
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