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I've had possession of (for a few weeks) both the 2" GS SV 30mm, and the Andrews UW 80deg 30mm, and they were both "ok" in my f/5 10".
The views were quite good, but there's no doubt the stars weren't sharp to the edge. It just depends how much you're willing to put up with the distorted shape of stars near the edge of the view.
While the Andrews UW80 had a wider FOV, it also had seagulls deeper into the field. The GS had a narrower FOV (67deg as opposed to 80), but the stars were sharper wider to the edge.. so the actual area of FOV that had sharp stars, was almost the same.
So, for the dollars, I'd probably go the GS 30mmSV, as you can usually get it on sale (or second hand) for $79. The Andrews 80 is nice, and it's a big hand grenade of an eyepiece, but for $150 i'd probably save up and spend $300 on something of a little more quality.
But if you're on a budget, the GS SV is as good as you'll get for the price, in a f/5 scope.
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