The HF kit seems like an OK deal but it's a dead end. You can't expand it, you're gonna be stuck at 100W. If you want something you can deploy to make a little extra power when you're parked somewhere and you don't need it to make much, then it's not that bad.
If that isn't your end game, if you want something you can permanently affix to your bus, if you want to go above 100W, you're way better off spending a few more dollars and getting something like a Renogy 100W kit. They're monocrystaline panels which are more efficient, it comes with all the cables and mounting hardware, and the charge controller goes to 30A instead of 10A. The 100W kit can expand to 400W just adding panels and cables. This is the 100W kit: https://amzn.to/2IU22fx
I used the 400W kit which saves a couple dollars over piecing it together one at a time. This is about as big as you should go before you need to be moving to 24v and using MPPT etc. I've been using this as my sole power source for 1.5 years. https://amzn.to/2KxiYOv