There's lots of ways to skin the cat. I haven't done a mc tour like this but from doing some research for the future, and from some non-mc tour operations, my two cents are:
The tour companies are selling you convenience and their intellectual property (in putting together the trip).
Sometimes, I think the specific guide is more important than the tour operator. They all have their good and bad, ups and downs, and quality assurance issues.
Unless you're going way off the reservation (Pakistan, Darien Gap, Zimbabwe) to where a local operator is super worth it, e.g. some security, health, support, border crossing expertise and local knowledge is needed (and even then, you can often buy it a la carte), then it all boils down to:
- do you want to do the work of putting together the trip? Truly enjoy it, or maybe don't but want to save the money.
- are you happy enough to follow the group, or do you want to steer your own course? Note that some groups will be set up for more free play, and others less. And some won't tell you.
- or do you just want a turn key operation, and are willing to pay for it?
I have heard mostly good things about Edelwei$$, Horizons Ultd, and Ayres. I'd also be just likely (perhaps even a bit more) to go with a small operator and a by-name guide recommendation from some I trust, than I would to just say, oh, it's XYZ Company, and accept that at face value.
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