Med/conceal hybrid is simply better. Played properly you're completely unkillable, can dish out ridiculous heals to everyone, and with 3 ta's constantly rolling, you always have a dps rotation lined up. (shiv,bs,3 lacs, probe, etc.) It's the best class for someone wanting to multitask to the max; it actually takes skill to use it to it's potential.
Saying all this, I'll just say I've been concealment since day 1 and owned with it, and never whined about the nerfs. I'm not even whining now, just saying that this hybrid is currently better and more effective after all the cumulative nerfs.. that's all.