We too have the Solera Toppers, and they are fairly easy to install, maintain, and hold up well as was stated in an earlier post. Ours have been on now for 4 yrs without issue.
Also as stated, they can collect some water but there are ways to mitigate the run off without alot of effort. Another plus with toppers are the sun block and heat reduction to the slide roofs. Prior to install, our inside slide ceiling would feel hot to the touch when in direct sunlight on hot summer days. By adding a topper, the temp drop is very similar to that of being under an awning maybe 10 -15 degrees F. That can be beneficial to cooling the inside of your RV.... definitely made a big difference in ours after installing.
All the above, and keeping debri/water off the slide roof(s) and not dragging it into the coach, or having to broom off the slide roof before retracting the slide made it a very good and efficient upgrade for us. Would definitely do it again and recommend.