- Is the quality actually comparable to a half-decent espresso machine?
- Are they as indestructible as they look? I'd rather not buy something which suffers from metal fatigue in a few months.
- Are they as easy to clean as they seem? Having something like three moving parts seems like it should be basically trivial to keep clean, even in an office with tens of users.
A lever machine allows you to control the extraction profile quite well. You can vary pressure and flow rate at any point in time.
The main downside you'll be experiencing is the lack of reproducibility. Maybe you'll make a perfect espresso. Then you'll try to make another one, and it will be over- or underextracted. This is what an automatic espresso machine gives you: More reproducibility with regards to the input variables.
The best approach would probably be just trying one. Maybe you can find someone who owns a lever machine that lets you pull a few shots from it.
Another alternative, if you don't want to spend money for a full espresso machine, but still want more control over the extraction compared to a moka pot, would be an Aeropress. It's not espresso, but it gives you a lot of control over the variables, and it makes great coffee. James Hoffmann has a great series on it: https://www.youtube.com/watch?v=aidvrssMSGo