I’m on my second truck with an ARE CX cap. I couldn’t imagine going back to a tonneau.
The CX is nice for its simplicity. Flat glass vs curved, is much cheaper, and easier to replace. Manual locks/latches vs electric, are more reliable. I often have a lot of valuable stuff back there, having a broken window or latch is not ideal during a trip. My cap can be repaired with a trip to a hardware store, or local glass shop, instead of waiting on OEM parts. The sliding/screened “windoors” are a must have. I haven’t had any leaking issues either.
Those RSI caps are nice, and well made. But cost 2x (and aren’t even paint matched). I’d rather save the difference for tags, or a pair of swaros or something.