Having genned a few characters and run them though a few combats, I've noticed a few things mechanically, mostly concerning the new Rate of Fire mechanic and the balance between different ranged weapons (I haven't really experimented much with the melee weapons)
1) Having a BS of 50, as opposed to 49 or 40 as opposed to 39, makes a massive difference in effectiveness when RoA is high. If your BS is divisible by 10, you will almost always hit at least twice with a RoA of 2 or higher.
2) Long-lases and Sniper Rifles don't see to do terribly well in comparison to Lasguns, but Bolters outperform Lasguns and Autoguns despite a lower RoF (Tearing is really very good).
3) Dual-wielding is very very good, even for characters who aren't Desperados and don't have Gunslinger. It is especially good when dual-wielding weapons with a RoF of 2 or higher (Autopistols, notably, but also Autoguns and Lasguns with Custom-Grip or Recoil Gloves)
4) Bolters used with Custom-Grip or Recoil Gloves are much, much better than Bolt Pistols.
5) Autopistols seemed to massively outperform Laspistols and give Bolt Pistols a very close run for their money.
6) Plasma and Melta weapons didn't seem to notably out-perform Bolt weapons, but I was mostly testing human opponents against each other; they may shine against superhuman enemies.
7) Storm-Bolters are head-and-shoulders above other weaponry. Dual Storm-bolters with Custom-Grip are akin to the Wrath of God.
Thoughts/Suggestions: I think Autopistols might need nerfing; either reducing RoF to 1 or lowering damage. I think Custom Grip and Recoil Gloves might need a look at (off the top of my head, reducing the RoF by 1 when Basic Weapons are wielded one-handed and/or forcing the character to use a Light weapon in their off-hand might help (So you could have Bolter-and-Bolt-Pistol, but not Bolter-and-Bolter or, Emperor have Mercy, Storm-Bolter-and-Storm-Bolter.
Edited by Ouroboros13