I like all SP albums as far as vocals go. "Unseen" opens really fine with 'Truth', also 'Mirror, Mirror, Life After Life' and 'Martyr' had a potent vocal performance by Rick. The album didn't coagulate as good as the previous ones due to the inner problems of the band, that eventually led to Rick to resign (get kicked, depends on the version) from SP. But since most of the composition comes from Katchisnky, I can't blame Rick for the product (same as the last two Judas Priest albums, it wasn't Tim Owens fault).
Actually I head a couple of samples of the new album and I believe are good enough to give the revamped band a chance.