Purchased used eBay caliper
http://www.ebay.com.au/itm/252260881918
Purchased 6 piston Caliper Bracket Kit in Gloss Gold.
http://gstwins.com/gsboard/index.php?topic=69375.0
New K & L pressure and dust seals.
New pads(MetalGear,AU).
2 new bolts for caliper.Pity cos A.Schultz included 4 SS allen bolts with the kit;2 longer(i believe for the bracket/caliper mounting) but they were the wrong pitch(1.5 instead of 1.25)

Thoroughly cleaned,and painted and baked the purchased caliper(baked in Philips Airfryer at 93C for 60mins)

Conclusion:
Noticeable improvement over the 2 piston caliper,and that's with the standard master cylinder.I'm currently debating an upgrade to either the Hayabusa master cylinder,the SV650 master cylinder,or the Kawasaki ZZR600 master cylinder.....or continue testing for a bit longer.
GS500Schultz's service had an extended time delay from initial order to actual postage,but to compensate for this he included new pads,free.His manner was always professional and communication was always present.

Overall:
I'm glad i went ahead with this decision.......now better;maybe later best.
Thanks Adam.
     
     
     
IMG]http://i68.tinypic.com/afgc2u.jpg[/IMG]       
     
     

That looks big and angry I like it.

sorry again for the Delay,
The CNC company I use was down to only one machine from their usual 3 machines.

I now how ever have the brackets, rebuild kits, pads, and Calipers IN STOCK and ready to ship.

Thank you for the honest review, look forward to selling a few more.

Very nice!!! I like it 

That does look mean. Well done.

A tip for ppl who buy this bracket:
I used new pads but there's no reason to not use your old pads if their within spec.

Because of the NEED to use the included 10mm spacer(don't worry I've tried spacers ranging from 3-7mm) that exposes the 3 pistons much more on the inside of the caliper(see pic)
What i did was remove the abrasive material from an old pad bringing it down to metal,and use it as a spacer behind the actual working pad.
The result is practically equal piston travel from all 6 pistons with NO ill effects...in-fact i think it's slightly better cos the 3 pistons are further home,so when operating your not compressing as much fluid,only steel.

Now this is a cool mod! Definitely worth thinking about. . .

Update: I bought a used Hayabusa master cylinder(http://www.ebay.com.au/itm/351716525387?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT) and rebuild kit(http://www.ebay.com.au/itm/311374040522?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT)
Installed everything and am now testing.It's quite handy cos a number of GS parts and Hayabusa parts are interchangeable.
Performance IS boosted but NOT amazingly,so if your happy with the standard GS master/Hayabusa caliper combination i suggest u stick with that.