Not familiar with Sieges Even, but maybe I should be?
I'm not quoting all subsequent replies, but I'm adding my emphatic yes
They've changed quite a bit throughout their discography. One constant factor is the amazing rhythm work by the Holzwarth brothers.
First album, Lifecyle is basically techno-thrash in the vein of Watchtower. The second, Steps, is perhaps their most "difficult" and impenetrable. Not nearly as heavy as the first, and kind of hard to get into. Singer is the same, and not particularly suited for the new style, in my view. Then comes A Sense of Change, with a new singer. This is probably my favorite. Very "pretty" album, great guitar work, and VERY strong Rush influence.
More changes for the following two records, Sophisticated and Uneven. Yet another singer, and new guitar player as well. I especially like the first of these two. Slightly different style, a little more fusion-y on one hand, but also heavier, as the songs tend to move at a generally brisk pace. Guitar work is still excellent. And the drumming is top class.
Then...you guessed it...more changes: the last two albums, The Art of Navigating by the Stars and Paramount, see the return of the guitarist from the first three and yet another singer - the best they've had, actually. As already mentioned here, they are both very good, with more focus on melody (although by no means "easy" albums)
The singer and guitar player have continued on with Subsignal (actually, if I remember correctly, it might well be they had put the band together before The Art.., but then decided to join forces with the Holzwarth brothers under the Sieges Even name), more or less in the vein of these last two albums, maybe a tad more streamlined. All of their albums range from good to very good.