We sold our Brompton and Merc when we moved and they stopped being used.

You get a Brompton because you need a small compact fold and need to carry a bunch of stuff. But it's not a particularly fun bike to ride unless the ergonomics and gearing happen to fit you well or you make a bunch of modifications.

When we moved, the need to carry a bunch of stuff and the tiny fold the bike went away. That is, a bike with a slightly larger fold but much better ergonomics and ride was more than satisfactory. A Brompton is not bad on the metro/subway/bus but it's a relatively heavy bike. On our metro system, I see folks carrying their Bromptons all of the time rather than rolling it while folded.

Anyway, it's a useful bike. We might get another set in the future. But it's worthwhile to test ride and test fold any bike to see if it fits your purpose.

Good luck.