How the Xabre stacks up, technologically, against the GF4 MX and Radeon 7500 is a little bit murkier now. Both the GeForce2 and Radeon (and hence the GF4 MX and Radeon 7500, in which the 3D bits are the same), included a a sort of proto-pixel shader capabilityNVIDIA called them register combinerswhich can handle some DX8-class effects. Also, both of those chips can use DX8's software vertex shaders as needed.
Still, SiS's choice here is logical, since emulating hardware pixel shaders in software isn't entirely possible, while software vertex shaders work pretty well. So the Xabre still looks like a compelling entry in the mid-to-low-range graphics market. Assuming even a fraction of the companies showing Xabre cards here actually brings those cards to market (and much depends on pressure from NVIDIA and ATI, frankly), little SiS's Xabre could prove pretty sharp. I've seen cards from Gainward, Biostar, Soyo, Triplex, and Gigabyte, among others.