I had two small leaks, one on each big slide. Both caused by the brilliant(not) 2 piece design of the drip channel that runs along the roof from the front to the rear of the RV. To seal the butt joint were they meet they used some tiny piece of white tape which failed allowing water to drip from the joint down onto the top of the slide, dripping under the topper. Water pooled up and found a way in once from rain, thankfully it dripped into the kitchen sink. The other side was caused by the condensation from the rear A/C. I was able to put some caulk on that one and fix it for now, just worried it could get to be a bigger problem if not resolved.