People complaining about the heartbeat sensor obviously havn't seen it, it is
NOT like the radar in the corner.
Firstly the dots aren't so fine so distance is hard to figure out. Secondly the buildings aren't 'etched' in like they are on the radar, there are none. Finally it takes a while to unlock according to IW, so w/ all these other attachments and Sleight of Hand as a first perk as well as Bling I can't see it being unbalanced at all.
And the thermal scope? Clever idea. Sacrifice really being able to use a scope(looking through that and killing a guy is 10x harder than w/ RDS for example) for being able to see where enemies are. Again, hard when there's so many buildings.
Anyway these 2 perks rock, they can be used against campers

Be sure to always have 1 class w/ a HBS hehe