DISCLAIMER : maybe its just me and my opinion, and we know about opinions
BUT
a modeled Bass? I cant see in the context of most mixes where a sampled bass with articulation or without wouldnt pass muster and not need modeling
Guitar on the other hand I would welcome and think about purchasing , thats where the rubber hits the road and you separate the men from the boys ,even though the current context of sampled guitar libraries are quite nice still they are sampled..
once again my pennies worth