They are good bags, hold up well, but will show wear and tear as the edges often are not finished. The leather is thick and very soft and unfinished. That is part of the look. They are a Berlin, Germany brand (where I live) and we have a more "raw" urban style here in Berlin and they reflect this. You will not have to be extra careful with rain as the spotting and staining is part of the look.
They do not have a fantastic resale value if you actually use your bags and then circulate resell them. I think because they will show wear and tear. The leathers are not finished, and little flecks and scratches will show.
Their zippers are great, they go like butter. All in all I find their bags very heavy though, and they tend to be really big. Even when empty they are heavy. For weight comparison, I find Marc Jacobs too hot to handle and the Ukita style, or Anya Hindmarch maxi zip satchel, and my Miu Miu large bow fine in terms of weight. I took an older style Liebeskind on a weekend trip with me and nearly died hauling it all over Hamburg for two days.
Hope this helps!