Positives: They're inexpensive, they can be rebuilt for little cost.
Negatives: They might be a little bouncy depending how you set it up as opposed to say KW's I've ridden in.
Really, they're bang for your buck coilovers. If you're not trying to get super serious with trackdays or time attack for street use they should do fine. I've ridden in Ryan's car and it tracks really nice. It might be a tad rough at times but with your heavier car I would think they would kind of balance out.
All in all the Subaru community loves these coilovers and they sell like crazy so they must be worth it
I plan on installing some this spring hopefully and seeing how they ride in my 08.