I use Bic Metals for overnights and stays up to several days. I prefer them to Gillette Guards by quite a margin. I would use them for longer trips but I don’t feel comfortable with such use of plastic. I use a Gillette GII (Trac II) for any trip that’s a week or more and requires carry-on.
I also ‘discovered’ Bic Metals on holiday in Greece - backpacking around the Cyclades in my case. I think it may have been Serifos or Sifnos? I was needing Sensor refills but could only find Mach3 and Bic disposables.
Before using DE razors, as a teenager I used to shave with those Bic Metal razors (since the late 80s IIRC). Being a disposable SE, they are probably what is the closest to DE razors. Some supermarkets in France do still sell them (I bought a pack of 10 this year for about €1.50 or 2).
Im definitely a cart type but i always use a good brush (omega) and several soaps (for my skin i found proraso Red is the best). That said i believe it's all about prep. I can get a perfect bbs with even a 50cents disposable bic