The unit is amazing. We got the other version first, the mini marker sprayer, and this one not only outlasts the other one, it makes the other seem like a broken design. It runs a good 40 seconds from a single 15–20 pump charge. It works with minis from the big colour packs (pimpsqueaks) and the large ones. Have yet to try with metallics. Blown away by how good this is. Remember to clean inside the pen chamber or you can get darker markers staining the tips of your lighter ones.