Have a look through my post history, but the basics are:
SG-500 on XM819 – 32:20. Has been my winter mtb for 5 years on an EBB equipped bike. I have ignored it and the cup and cones are shot after being jet washed (bontrager 2011? I think) and not re-lubed – which is a shimano hub thing as opposed to alfine. I’ve washed the bike 5 times, I lube the chain occasionally (once/twice a year) and that’s it.
Shifting is still perfect. I have a replacement hub to be laced into a new wheel but not actually sorted it yet as I’m using the rumbly wheel just fine.
SG-501 on Open Pro 44:18. Has been my all year commuter/pub/kiddie tow machine for 4 years over 3.5k miles I reckon, I’ve had it serviced once (as soon as the cup and cone went on the mtb) when it had a new set of bearing on the Alfine crankset and it’s been very good. I’ve had the plastic cover/pin thing come off once (hooning after a fella that cut me up) but that’s a 10 minute fix. It’s been washed and oiled less often than the MTB. I did struggle on the Wicklow 200 with it up the Shay Elliot but that’s a power (low) to weight (high) ratio as opposed to the hub.
Swopping the rear out is easy with a 2.5mm allen key, afaik the newer hubs have a tab instead of requiring that. It’s a 20 second job instead of a 10 second job. Lining up track ends is harder than the EBB and you need a 15mm spanner for the bmx thread nuts. I’ve gotten stubby 15mm spanners drilled for wingbolts attached to my frames rather than carry one in my back pocket.
A lot of people don’t quite like the difference in shifting between the derailleur and a hub, it’s not something you use to chase down every last extra erg of power. Tend to sit in a gear and keep spinning away with occasional shift up or down, rather than constant shifts. It will feel heavier than a SS though (obviously), but I don’t find it noticeable until I throwing the bike over a gate/style.
My other bike is bog standard shimano FS which I tend to only bring out when it’s dry because I can’t be arsed with the maintence post ride.