Well, I use recon units through GC40, maybe in the first scenarios og GC41, but later on for me they seem too weak to be used. Other units got the sighting bonus, too (Kradschützen f.e.). OK, they have the recon move, but I prefer firepower (i.e. tanks). So I use an additional tank instead of a recon unit.
In GC42/43 West you start with 9 units (plus SE). For me it is not worth "wasting" one space for a recon unit. During Hardelot I receive three recon units. After the scenario I sell them.
What are your experiences and suggestions?
How about AA units? In the East I never use them (except the "Achtacht" of course

). In the West I use the 12,8 Flak I receive during Syracuse. I usually downgrade it to an 8,8 Flak, so I can use it against tanks and have still considerable anti air power.
So, does anyone use the mobile AA units? Any experience with AA so far?