You shouldn't have a problem with fit or comfort it is actually quite a comfortable BCD (it should be, with the padding it has). I did not have a probem with the sternum strap covering the inflator valve on my drysuit - it would clip almost diractly over it but it was never a problem to inflate the suit. With a crotch strap, there is no problem with the unit riding up on the surface (I wouldn't use a Ranger / Ranger LTD without one).
The issue, as others have mentioned - the Ranger / Ranger LTD are padded, very buoyant BCDs. You pay a price - in terms of needing extra lead - for that buoyancy. You are already looking at needing a bit of lead for the drysuit, particularly when diving with thicker undergarments and a single cylinder. Adding an aditional lead requirement for the Ranger is inefficient. I needed a huge amount of lead when diving a single AL80, dry.
I switched to a SS backplate because of the buoyancy issue. Even with the BP I needed 16 pounds when diving with thick undergarments and a single (HP steel) cylinder).
Great BCD, Zeagle has been a good company to deal with. I just prefer something simpler, and more negatively buoyant, when diving dry.