I like Navy Seals, they can heal and move. I use them to make raids deep into the enemy's territory, or to make hit and run attacks by attacking an enemy and running away. They seem to be better than gunships for deep striking.
Using them for these purposes, even when there is a lot of land, has helped me defeat an enemy late in the game when there is a large modern war.
Personally though I would have like to give them the option to paradrop, or be stealthy to add that little more. Some of the UU are much better. The Panzers are great, but only for a short period of time, does their bonuses extend to Modern Armor, if not it should (maybe upgrade to a slightly better Modern Armor of 41 pts).