Howdy
I got a chance to play in the DH BETA adventure run by FFG Tim at Gencon. We had fun. The good , the bad , and the ugly. The good was the new sector content. The bad was the departure from role playing skills, and the non compatible AP system. The ugly was the elimination of a stack of very pretty and pricy DH books as mechanically compatible. The deal breaker is the damage system. What our group has loved since the first edition DH Beta is the way that combat is dangerous and lethal. Guns, grenades, flamers, chain swords, and bolters kill people, so it forced the PCs to role play, use threats of violence, and go into combat with the upper hand or get a new bionic body part for the next adventure. We already have only war and deathwatch, we need combat to be dangerous so that undercover agents of the Inquistion don't have to carry las cannons to actually kill heretics. If you want to have everyone carrying basic and heavy weapons keep the Beta damage system and the days of anyone being under cover are over.
This is by far the best argument I have read thus far.