I finally got the pair of new front struts installed into my 1999 Seville STS (85 000 miles) and here are some first impressions on them.
First off, the costs. The struts are the Monroe parts numbers 40021 and 40022 ($430 a piece at Rockauto), and I also had the strut mate bearing plates (Monroe #902972, $62 a piece) changed at the same time. For reference, one OEM strut is over $800 at Rockauto, and $2500 at the official Finnish dealer.
To sum it up: the ride is fantastic! Firm in sharp turns and smooth in rough surfaces. The old struts must have been in really bad shape, the difference is just incredible. They still stiffened up properly in turns, but the ride was bumpy over rough surfaces and floaty over low frequency bumps. I guess that the CVRSS struts begin to wear out in the lower dampening rates, and the stiff suspension of the STS results in a harsh, jittery, bumpy and shimmying driving experience.
Furthermore, the "Seville shakes" appear to have diminished greatly if not eliminated alltogether! Previously I've got new tires (Michelin PS), different set of wheels, road force balancing, engine mount changed - none of which eliminated the shimmy. Tires and RFB helped a lot, but it was still there. The final verditct is still out on this though, I'm not holding my breath I've just had the struts for a day and the shimmy is an annoyance that comes and goes.
Anyways, if any of you are considering new CVRSS struts for a 98-04 Seville, or are sufferning from a bumpy ride, I wholeheartedly recommend these Monroes! I've never driven a brand-new Seville but I can't imagine the OEM struts being any better than these.