Its fun, only problem is Power Plays. Either remove them or enable Boosters to work as well -_-
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power plays ruin it for sure. Especially with these 2 guns. With exposed, I would get rushed from around the corner with a SAS and not be able to do anything since they see me before I see them. Double damage is...well just look at how fast the guns kill without it...and with marked man, you gotta learn to dodge mag bullets like crazy and not let anyone get near you with the SAS.
Other than that, I quite enjoy the lab as most games end up real close. Already got like 3 sudden deaths, which were tense.
However, power plays should be out when you have instant kill weapons. They did the right thing to remove kickbacks ( as much as i like them )from the Lab as people will then use weapons different than the starting weapons. But boosters should be in, no doubt.