just tested the changes in 7.0 and i REALLY have to say... the recon 251 is AWESOME!
The unit has exactly what the bunker did not have: GREAT SYNERGY with the other abilities and the theme of the commander.
251 have great synergy with assgrens / grens which can be transported and reinforecd by the 251. If you need the flare on a specific position you can move the unit and use it there.
Recon 250 would be a great replacement for "Spec ops flares", 251 could be available in the battlegroup hq.
TigerAce is now tied to tech (Heavy Panzer Corps) which is consistent with the changes to OKW Tiger I. I support these changes but you should also include it in the patch notes!