I got a Sonder Frontier (Recon Rumpus 650b+ version) just over a year ago.
Mainly got it for offroad bikepacking and day rides.
Great bike, very happy with it.
I got the handlebars changed from standard to the Confucious model which gives slightly more luggage carrying capability.
I lowered the gearing myself after delivery with a 28t chainring and 11-46 cassette.
Only problem I had was with the Sram shifter, it was jamming occasionally, turned out to be a kinked cable which must have been installed badly when it was built up. In any case I changed it to Shimano when I changed the gearing, and all good since.
We went down to the Ambleside shop for a half day test ride before I bought it, and because we were only out for a couple of hours rather than a full half day, they didn't charge anything. In any case, if you pay for a trial, they knock that off the purchase price if you go ahead and order one.
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