Give the 4 and 6mm a miss - the eye relief is too tight, the 9mm you may get away with. The 12,15 25 and 32 mm give reasonably sharp and contasty images. A little edge distortion but not distracting. Yes they are not Televues. I have the Meade 4000 Plossl set also and the GSO's give only milldy inferior images. I have used them over the past 2 years in my Meade 8in. SCT, GSO 8 in Newt. Orion ED80 /100 and my current Equinox ED120. They are best in F.6 or slower. You don't really need the set. The 3x GSO barlow introduced excessive CA - the 2x is better. For the price you can do worse.
http://www.agenaastro.com/articles.asp?id=132