no, i didn't have problems with mine getting dented. I had the composition. The inside and the frame was great.
I noticed on mine that the edges of the composition pattern/colour wore away quickly. It wasn't awful but noticeable to me. The black edge on the binding area puckered after 3 days. It made a crinkling sound. I assume that there wasn't enough adhesive used. I liked the case though and didn't return it. I just wouldn't get the composition again unless they fixed those issues. I for sure wouldn't get one now that it is $20 more. I also wouldn't bother with the sticker and I'd take the one off they put on because the sticker wore away & looked ragged after about 60 days.
When it comes to cleaning don't use any thing wet on the composition. Other than a dry wipe down you shouldn't need to do anything. If it gets wet, be careful because I got black on my bed @ the hotel from the cover.
I bought a third party 6ft griffin charger cable and it did not fit, i couldn't charge my ipad 1 unless I used the regular apple cable. So I took a dremel tool to the port area of the frame and afterwards my 6 ft charger cable fit.
That is my experience with the Composition case. I'm waiting for their additional leather cases.
I love Portenzo I will support them because they are great. So don't take my criticisms as a person who wouldn't buy from them again because I will.