count on the humidor holding 50-75% of its stated capacity
included analog hygrometers are for show, count of spending another $20 - $25 on a digiatal hygrometer.
supplied humidifiers are usually the green florist foam type. do they work? yes, they do. you will need to use humidor solution, not plain distilled water. There are more high tech versions of humification like gel humidifiers, and beads and Bovedas that let you pick a humidity level. As you gain more knowledge, and hang around BOTL, you will probably upgrade your humdification as your collection grows.
site sponsers such as myself, heartfelt Industries and others can supply you with anything that you need. Site sponsors are also proven to have great customer service, and usually provide even extra service to BOTL members.
ask opinions before buying.