I've been using #Kiwix on my phone for the past few days, with the ~48G full-Wikipedia-sans-images, the full Wiktionary, the #ArchLinux wiki and a couple of others, first impressions are pretty positive. Search is a little sluggish to get going but results and click-throughs open quickly. Overall it's faster than web. Feels safer to have such extensive references available without internet for emergencies; similar to downloaded OSM maps. Recommended, give it a try *before* you need it!