I built a CM Typ VII for a client many moons ago, taking many hours and much rework of each of the kit's six parts. More recently I started another one, only to drop it like a hot spud when I learned of the Revell offering.
Their kits (aircraft, too) are devoid of sharp, accurate detail, and may be enjoyable to the scratchbuilder or fairly skilled vac form builder. Beware that their hull lines can be a bit, um, "imaginative", resulting in a lot of corrective surgery if accuracy is required. No periscopes, guns, props, shafts, anchor, deck furniture, etc, at least when I bought mine. All visual appeal is up to the builder, but with enough time and hard work they can look good.
I'm not saying their stuff is bad - it is just not state-of-the-art for vac form kits. If you build one you will feel you've accomplished something.
Mick