Given the tire size you can use on the Checkpoint, the AL will not be harsh or whatever. The rear triangle and bottom bracket may be stiffer than the 520 and you'll likely appreciate that when you crank on the pedals. You might have to buy some new bike luggage if you plan another tour but that's kind of a non-issue IMO, there's plenty to be had. Edit- Checkpoint ALR5 advantages over your 520 include thru axles with current spacing, carbon fork, hydraulic discs, a nicer component group and tubeless ready.