1. does it work? yes. it does.
2. any elements to make it difficult? no. well. maybe it’s length.
3. does it work every time? yes. without doubt it works. every time.
4. does it degrade over time. never. unless you crush the glass… bad.
5. requires maintenance? just wash it with warm soapy water. that’s it.
6. an upside? well. it provides one with self-pleasure. end of story.