We have a Specialised Tow Pro, tow cover that was a 'Show Offer' when we ordered the caravan. It fits well, is easy to put on single handed by unzipping the offside feeding the nearside in first, then the zipped piece on the offside, zip up clip in at the top and the elasticated straps along the bottom, job done.
This is our second season of use and it keeps the front clean. No window scratches. It only goes up to the 'sunroof', so the 'Sterling' logo is visible.
We first thought it would be problematic if wet when we arrived on site and had no awning to dry it in. That has proven unfounded and we drape it over a fence / gate /car if soaking that hasn't really happened yet.
Ours is a one piece one, so once its fitted you can't easily get into the front locker, or use the grab handles, but then we have a mover.
As it was effectively a freebie we don't really know if it is value for money, but we are overall happy with it.