Cosco OPUS 35 reviews? what do you think?

my daughter is a tall one, so we are looking at getting this seat (she will grow out of her Evenflow any minute now...) so unfortunatly we have to get a new infant seat. we want one to use with the snap n go.
wondering if anyone has the Opus and if so, what does it look like? do not see one in stores out here, only online...is it a huge monster, or is it reasonably sized? any trouble installing it in the car? (we have a toyota avalon)....
thanks for any feedback, aloha, leilani