First, at 5'6" the lowering kit for the Norden 901 was a must for me. And even if 22 mm doesn't seem like a lot, it is a game changer from going to touch the ground with the tip of your toes to actually being way more comfortable when you come to a stop with the bike. Still not having my feet flat on the ground, but a nice and noticeable change, that is a big PROS.
Now, the CONS: 1) it's not a DIY job for everyone (I did). You certainly need to know what you do (especially the fork) since not only you'll change the spring, but you'll have to disassemble the fork completely to put the spacer. For many people, it will be a job for a pro mechanics and will add (obviously) cost to it, probably another $600 to the already $600 for the kit. Changing the shock is easier, but you need to know a few tricks to make it effortless (I believe Rottweiler has a good video (on the 890 KTM?) that is very good. 2) The Norden 901 stock shock has features like preload and rebound. The new shock (22 mm shorter) has none of that: just a shock with a spring with non-adjustable preload and rebound! I believe it is a KTM 790 shock. The shock works OK, but it is IMO a downgrade to your suspension. Is it because the manufacturer has a bunch of these shocks sitting around, I don't know? But maybe the Touratech kit is a better option since you keep the stock shock with swapping only with a progressive spring?
I did a test ride with the 'new' suspension (couple hundreds miles), and did not notice any particular behaviors different from stock: not better, not worse. But, again shortening the bike by 22 mm was really appreciable. So overall, I would still buy the product but I definitely cannot give a rating better the 'average' because of the shock.
