I got the 27.5” wheel version, and have taken it for a couple of quick spins, and initial impressions are that it’s going to be a lot of fun. I’ve got my position set very similarly to that on my Santa Cruz Stigmata, with the same saddle, handlebars, and pedals, so all of my touchpoints are the same.
As built, my 52cm Hakka is 19.4 lbs; whereas my Stigmata is right around 18 lbs, but the Stigmata has 700c carbon wheels currently set-up with road tires, and the Hakka has the 27.5” alloy wheels with 2.1” wide Schwalbe Thunder Burt MTB tires.
With the stock wheels and 700x40 tires, the Stigmata came in at 18.7 lbs with the same pedals. I still have the stock wheels from the Stigmata, but need to get some 160mm rotors and endcaps to convert the front wheel from 15x100 to 12x100 to try them out on the Hakka, and see how the weight compares in 700c mode instead of 650b/27.5” mode.
This Hakka also came spec’ed with a SRAM 1x drivetrain. I’ve ridden SRAM 10-speed before on the road, and I liked it so I don’t expect there to be any problems there, but it will be interesting to see if there’s any real compromise with the bigger jumps between gears and if I spin out on the descents; the crank is spec’ed with a 40T chainring up front, and an 11-42 cassette in the rear, so my biggest gear will be slightly taller than a 53/15 or 50/14.
I could swap out the HG freehub body for a SRAM XD driver, which would allow me to use a 10-42 or 10-46 cassette. A 40/10 combination would be the equivalent of a 52x13 and just slightly smaller than a 50/12 … but these days, I’m more concerned with getting up the hills than spinning out coming back down them.
I have no doubt that the 27.5 wheels and fat tires will be able to absorb any really crap roads I might encounter, and even some of the more well-used mountain bike trails in the area, as long as the descents aren’t too technical, but its performance as a road bike as well will be a question until I get the wheel & rotor situation fully resolved.
I do have one small niggle about the Hakka MX, but it's really minor. The Hakka comes built with thru-bolts requiring a hex wrench to remove, rather than a QR-style lever (like the DT Swiss RWS thru-axles) which you can use to remove them without having to break out tools. The thru-bolt for the ENVE CX fork supplied with the frame uses a 6mm hex key, but the rear wheel thru-bolt supplied with the frame requires a 5mm hex key. If you’re carrying a multi-tool, that’s really kind of a moot point, but if not, it is an extra hex key you do have to carry with you.
All in all, I think the Hakka MX will be a more versatile bike than the Stigmata for the adventure/bikepacking and gravel crowd, as well as a fantastic cyclocross race bike, but at this point I'm not yet convinced it will be quite as good on the road as the Stigmata. That said, it will be a heck of a lot of fun to ride, no matter what the road conditions are.