Hi, congrats on the purchase. I've had my Joe D24 for just under a year, have had a chance to put it through its paces and customize it a bit. Here are my findings:
* Tyres - generally the Big Apples are nice, but I took them to a country road and quickly got a small crack in the rear tire. Lesson learned, these are city tires.
* For winter seasons I bought and installed Shwalbe Marathon Winter tyres, got them on right now. Very comfy on flat ice, but next to useless on uneven ice.
* Seatpost - I threw away the one that came with the bike and bought a Serfas Rx Cruiser instead. It's a comfy cruiser saddle, again, not cheap but probably the best choice for this kind of bike.
* Handlebars - I've tilted the handlebars up to almost the absolute vertical position, but now I purchased the NC-17 trekker handlebars which should be even more comfy. I decided not to get different grips though because then I'd lose the key in the right grip.
* Mudguards - still struggling to find ones that fit. Tern/Biologic (PremiumBikeGear) do
not sell them for the Joe, only other 26" bikes, so you need to shop elsewhere. I'm thinking SKS Bluemells maybe. Currently using cheap $10 mudguards, they suck
* Hardtail bikes hurt. I spent $200 (!) on a Cane Creek Thudbuster ST under the saddle to take some pain away. Doesn't help the wrists though.
Overall, I'd say I've enjoyed this bike quite a bit, but realized it's too small for me: I'm 175/75 so 27.5" tires make a lot more sense for me. Bike feels tiny compared to my other ones. But for a folding bike, it's really awesome, though if I had to go for one now, I'd try avoiding a hardtail.