I’m not the seller:
That’s the 3rd Gallagher set in 2 weeks. Looks like the Christmas VISA bills have arrived!! 
Is it worth that amount?
With a starting bid of $1,800? I assume you’re serious?
A quick look on Seth’s site lists a new practice set for: $2,200; and the hard travel case for $160. His lead time is also now approximately 4 years.
I’d say simple math shows this to be a very good deal.
I will of course depend on if it gets any bids, and then how high it goes, bit I would not be surprised if the ability to negate a 4 year lead would be worth a fair deal to some…YMMV.
There’s also a Gallagher practice set on D’Arcy’s website:
http://www.uilleannobsession.com/classifieds.html#8
The thing to bear in mind about both these practice sets is that they are SG’s old design. He’s changed the design of the outside and, from what I understand, the inside of his concert chanters in recent years (although I’m open to correction on the latter point).
Still, as Brian points out, both sets are below SG’s list price and don’t include certain extras like the hard case or tutors.
By the way, I have one of those hard cases. I removed the divider and it fits my Whitmer full set without having to remove the bass drone slide section.
Does anyone know what internal changes he’s made? Not to hijack, but I’m curious what the difference is between the old design and the new (internally). I’m assuming the outside change you’re talking about is to the Kenna-esque turning.
As I’m aware in talking to Seth when he’s been out to our tionól and at length on the phone over the years, his chanter design was altered to ease the tuning on the E note in particular. But apart from that no other modifications have been made to his bore design overall so far as I know of. A quick call to Seth would quickly put that question to bed no doubt.
It should be noted that in the space of just the past few years Seth’s lead had doubled. Again, I would certainly take that fact into account when calculating a “reasonable” price for these sets for sale.
I recently had Seth update my chanter. It now looks like the old type with the brass mount instead of the turning, but it’s modified with the new bore etc.
The changes Seth made that I can see were to fill a number of the tone holes and change size and position. He also shortened the overall length, replacing the mount on the bottom. The top hand tone holes were moved down and the f# hole is smaller. I think the D hole is more scalloped.
The chanter was nice before, but the changes have improved the tuning, both E’s, left hand both 8ves. It’s still recognizably the same chanter to play and the old reed still works, but it’s also subtly different in the way some notes respond - hard D (easier), low e, low g (one finger in a triplet), and all 2nd 8ve notes.
For someone considering a Gallagher chanter, the old design is fine, but I think the changes have improved it.
I believe Seth states that he will ‘update’ any of his older chanters to his new design free of charge if the owner wishes it. If there is any fee involved for the switch you may just try to bribe him with massive amounts of waffles covered in ice cream. Seriously! 
Seth updated my chanter free of charge.