Several points to consider:
1. Pride of ownership.
This is a big thing with some people. Those people like Shiloh Sharps rifles, and they are very well made.
Part of that dates back to the 1990's after "Quigley Down Under was released and the Sharps suddenly went from a small niche market to a very popular rifle. Shiloh Sharps rifles went from available and expensive but still affordable, to a 3-4 year wait list, with way too many people buying them with the intention of re-selling them, - often successfully at a 300% mark up.
I put those folks in the same scab pile as the folks who hang out at Wal-mart after the truck arrives to buy up all the .22LR ma to re-sell at inflated prices. It was an unethical practice then and it's an unethical practice now.
At that time, an $800 Armi Sport or Pedersoli available on the shelf to take home today made a lot more sense than a $1600 Shiloh Sharps you'd have to either way 3-4 years to get, or pay $4K or so to take home right away. If you were a shooter who planned on using the hell out of it, there wasn't much of a decision to make.
If you were a shooter who could afford it, you spent $2400 for both the take home today $800 Italian Sharps and $1600 for a Shiloh Sharps on a 3-4 year waitlist.
2. C Sharps Arms is the other US family owned player in the game.
Shiloh and C Sharps Arms started out as a single company in 1975 but the owners had differences and split in the 1980s.
Most folks give a very slight not to Shiloh on fit and finish, and some folks give C. Sharps a very slight nod on accuracy with the Badger barrels they use. The cost is about the same from either company for a comparable rifle. The difference is that C. Sharps will ship you a rifle in maybe 3-6 months where Shiloh will still take a couple years.
3. Accuracy
The Pedersoli rifles are well made, but their Soule sights have some issues.
The windage adjustments are a lot slower as you have to account for some slop in the sight and lock it down consistently after each adjustment. In some cases the sights have led to the rifles getting a bad rap, and that's just not the case.
The Shiloh Sharps, C Sharps Arms rifles, the Pedersoli Sharps rifles and most of the Armi Sport Sharps are all 1-2 MOA capable rifles when equipped with a high quality Soule sight. The difference between 1 MOA and 2 MOA really comes down to the person developing the load. If you use a known source of foundry pure lead to develop your bullet alloy, cast with a great deal of attention to temperature and fill and then weigh the resulting bullets for consistency and put an equal level of effort into the powder charge and compression, you can get exceptional accuracy. If not...you'll probably blame the rifle.
4. $1600 for a Shiloh Sharps in very good condition is a good price.
The sights are probably worth $200-$300 depending on what they are, so you need to add that to a new role cost of about $1900 for a plain jane rifle like that. So you're saving around $500-$600 dollars over a new rifle, and you're not having to wait. But if you're in it for the pride of ownership "gun art" thing, those imperfections on the used rifle. might bother you.
5. It won't make you a better shooter.
With the exception of the Pedersoli sight issue discussed above, a Shiloh Sharps probably won't make you any better shooter than you are with your current rifle. And if you have got Pedersoli sights on it, I suspect you'll be hard pressed to see any difference downrange.
Stop worrying about what folks on the internet might think. If you want it, just get it. But be sure to have reasonable expectations and understand exactly why you want it - or not.
6. I've been happy with my Italian Sharps.
It shot great with the 480 gr Lyman 457658 bullet with a compressed FFg load when I lived in SD and shot it at longer ranges, and it shoots great here in NC at 200-300 yard ranges with commercial cast 405 gr flat points on top of 14 grains of Unique and a poly fiber wad.
I've owned it about 20 years now, it looks nice, it shoots great, and it didn't cost me an arm and a leg or make me wait for years. I got no complaints.