KAMarks, as Mr. Offshore (Claus Franken) points out, they are NOT for the beginner. He clearly states that his plans & formers are just a <i> help </i> in developing your own scale model - take it or leave it.
There have been extensive discussions on the Offshore plans in the German forum, there are many models as well - so it is hard for me to summarize the points of the various discussions. It is generally agreed that most fly well, once you get around the building stage.
Some are older designs (MiG-15, P-80) and some are brand new. It is my personal impression that the newer ones are better designed. The Eurofighter is a brand new design, quite large and challenging since it's a twin (MF480 cut down to 66mm).
I have built the <A href=http://aeneas.ps.uci.edu/edf/mig31/mig-31_n4.jpg> MiG-31 </A> and now the <A href=http://aeneas.ps.uci.edu/edf/mig29/p1060001.jpg> MiG-29 </A>. I have compared the MiG-29 plans to 3-d views of the original, and I can attest that overall it's very close to scale.
The plans are quite nice, well thought out & nicely drawn, the instructions are fairly detailed - but unfortunately in German. The formers are usually quite a few (12 for the MiG-29 for example) and very precisely cut. The fit of the formers with each other and with the stringers & sheeting is good too - and usually well thought out.
<img src=http://aeneas.ps.uci.edu/edf/mig29/pc240001.jpg width=400 height=300>
The wings are foam sheeted with balsa (the foam cores can be obtained in Germany from HS Flaechenservice), I had to make <A href=http://aeneas.ps.uci.edu/edf/mig29/pc250009.jpg> my own </A>, the plans will I think clearly show a dihedral if there is one.
The balsa sheeting for the fuse varies, it's indicated - in mm - in the instructions & plans (at least in mine, usually 1.5mm for fuse top & thicker 2mm for the bottom. I even used different sheeting thicknesses for top & bottom of wings.
If you are lucky
they will possibly develop into good flying & sharp looking models, but keep in mind that you don't get much more than a plan & getting it to fly decently can be a challenge...