Health Insurance premiums are very high. If you have a family, you end up paying $1200 a month and has direct effect on your monthly income. Even after paying so much of premium, the plan that you get is of Bronze class, in short not the best one. Out of pocket, annual deductible are soaring high (in the range of $12K/year). So think about premiums before you accept the offer and negotiate upfront so that you get good in hand even after paying premium.
Otherwise everything else was ok. There will be little to no interaction with their personnel as most of the client side communication is taken care by TEKSystems even monthly reviews etc.