G&G brand or other non oem inks for large format epsons

[miprints]

Does anyone here use G&G brand or other non-oem inks with success in an epson large format printer like the 9600?

On ebay I see

1 T544100 pigment photo black 220ml
1 T544200 pigment cyan 220ml
1 T544300 pigment magenta 220ml
1 T544400 pigment yellow 220ml
1 T544500 pigment light cyan 220ml
1 T544600 pigment light magenta 220ml
1 T544700 pigment light black 220ml
$139.99
for full set ultrachrome type archival quality
These are G&G brand
New cartridges (not refilled)
all cartridges are sealed and in a retail box. 220 ml each

I'm wondering if I could have the epson quality for photo posters and banners but cannot afford the oem inks for these uses (will be on display for a week or two at most each and customers looking for a lower price per poster than I can deliver with the oem inks.)

 

[miprints]

I have read that the fade resistance of the G&G inks isn't close to the Epson OEM, but the application I'm thinking of is for posters and banners that will be displayed for 1 day to 2 weeks, so fade resistance isn't much of an issue.

I'm curious though:
1.) will the G & G inks run well, or will they clog or damage the 9600 heads over time
2.) can I use them interchangeably with epson inks, or would I have to purge the whole ink system? In other words, if I know I want to print some more archival work, would it be possible to remove the G&G cartridges and insert the epson OEM cartridges, print 2 or 3 posters, and then be running epson ink through the nozzles for photographic work?
3.) any other options for less expensive ink than epson oem ink for the epson 9600 that runs well and doesn't clog or damage the nozzles?