I have the Sentry CT, and while it isn't 100% leak proof, it handles car washes well. I only notice a little water near the tailgate - not sure if that's the cover leaking, or because I haven't added any tailgate seals.
Over a long day's steady rain, I'll get a little dripping along the sides...
Here's mine, couldn't be happier with the way the color looks in person. I was initially second-guessing it based on the renders, but very glad I didn't switch to something else.
Ecoboost XLT with AWD, FX4/Tow package, CP360 and spray in bedliner.
Also pictured is a Truxedo Sentry CT, which...