With the original or cast iron Bullets as our American cousins refer to them, er... it depends!
You do at least have the benefit of what is still mostly the Redditch design, but again there are "issues" for anyone who wants to ride them enthusiastically.
1. Remember that the 500 is an over-sized 350. The weak spot with this capacity hike turned out to be the alloy con-rod, **usually** OK on the 350, but more stressed on the 500. We have had examples here where people have successfully tuned their engines with our hosts' go-faster bits, but have found to their horror that the alloy con-rod snaps after a while. This often wrecks the crankcases, and replacement 500 crankcases are getting harder to obtain. To be fair this was a known problem even in Redditch days, particularly when the Americans started using the competition models for serious flat track racing, so the blame for Indian Bullet rod failures cannot be laid solely at the feet of Indian metallurgy. The answer is of course a con-rod forged from some decent high-tensile steel, and to be fair to the Indians their use of a steel con-rod in the Electra-X was a big improvement. A failed big-end at least won't wreck the crankcases.
2. The other main issue surrounds the Indian 500 bikes' pistons, a design weakness means that the piston crowns can come adrift from the rest of the piston, more mayhem. Our hosts sell decent forged pistons, standard 6.5:1 as well as high compression, which are a lot less likely to fall apart.
A well sorted old-style 500 Bullet does, as Norm says, make an excellent bike, and if you want one which has had a proper rebuild with all the mechanically good bits as well as a tuning job, I would draw your attention to the bike known as ASBO26, currently a cafe racer 500 Bullet. It has had a recent engine rebuild by our our friend Bullet Whisperer using a steel con-rod and roller big end, as well as a decent piston, the thing goes really well, and it's owner has listed it for sale (on here as well as ebay) for a ludicrously cheap £2750, if you appreciate the work that has gone into it you will know what a bargain that is.
https://www.ebay.co.uk/itm/173887305673?ul_noapp=true
A.