A 6" refractor for that price is just too cheap, it probabily has bad optical fault like lots of chromatic abberation (blue and who knows what else halos).
I'd only get it if I was absolutely certain they'd take it back with a full refund.
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)
Carrying around my 20" obsession is going to kill me,
but what a way to go.
+ 12"LX200, MK67, Meade2045, 4"refractor