I use Sennheiser 300 IEMs for Video Village and Lectrosonics IFB for my Boom Op and Sound Utility. I prefer the Sennheisers over Comteks but that's just my opinion. I have not had one client complain about them. They actually like them.
Now if its a Reality show/Run and Gun and they want IFB I use my Lectorosonics because those will uphold a lot better out in the field because on those type of shows IFB's can sometime get dropped(I always hope they don't though) and the build quality is better.
Hope that helps.
Nicole