I am looking ot improve my match reloads and am ready to step up to case neck turning. I just dont know which device is going to be the best. So what can you experienced match quality reloaders tell me? here are the ones I am debating

forrester
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=219509

hornady
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=161996

lyman
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=379818

r w hart
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=113989

rcbs
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=541007
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=773444

my experieince tells me that the forrester is going to be the best, I just want to hear from experience.

I like the Sinclair tools:

www.sinclairintl.com/cgi-bin/category.cgi?category=search&item=NT-4000&type=store

K&M.  And the K&M carbide 4 flute turning pilots which will take care of the donut too.

Quoted: K&M.  And the K&M carbide 4 flute turning pilots which will take care of the donut too.

The Sinclair first, the KM second,, both are good. As for the "donut cutter",, you don't need that unless you are shooting a tight necked gun.
'Borg

If you have a match chamber neck turning may help, but if you are shooting a factory chamber I would advise at looking at your process vs chasing something that ma not help and is time consuming.

Technique and good equipment turn out might consistent reloads.

Don't get confused with "Match chamber" and tight neck,,, not even close to being the same thing.
'Borg

Quoted: The Sinclair first, the KM second,, both are good. As for the "donut cutter",, you don't need that unless you are shooting a tight necked gun. 'Borg

I hear the Sinclair first thing but ouch they are proud of their stuff.  As far as the donut cutter I guess I just sleep better at night knowing that the bearing surface on the bullet is consistent.

Oh and if you have a rather normal chamber you still can realize some benefit from cleaning up your brasses necks, you just don't turn them to a specific amount of relief but you turn them to clean up ~90% of the necks.  Think of it as making the inside and outside of the necks as concentric as possible without removing any more material than needed.  Use layout fluid, blacken the necks or a magic marker to get to the ~90% mark.

'Nother thing most people don't know or think about is brass with thick one side/thin other side is that the brass stretches on the thin side more every time and has a tendency to split there first. With concentric neck thickness, the brass will go longer before splitting.
'Borg

I am shooting a factory built armalite ar10-T, would  not see much benifit?

Them main reason I am perusing the neck turning is I purchased a 1k lot of lc same headstamp brass and am spending a LOT of time doing it right, I noticed after trimming and deburring in and out that a lot of the cases had a noticeably thicker neck on one side than the other. I figure this HAS to effect accuracy.

It does, but only your rifle can tell you how much.
'Borg

Has anybody used the new Sinclair tool yet?  Is the pilot depth setting mechanism "eccentric" as in whimsical or not concentric? Or the better question maybe how does it work!

With the Sinclair you will need the expander mandrel for best results.  It is also recommended to get the 0.001 larger size mandrel for smoother operation.

Added:  You had stated a neck turner for the serious Benchrest shooter.  It will cost you over $200 for all you will need with the Sinclair.  Obviously, there are more economical solutions that also function very well.