The UMP has been a very strong weapon in Counter Strike. The viability of the UMP Buy on the second round is still very strong. Recently Valve made some changes to the range of the UMP.
Imo range was Never the problem with the UMP.. still OP.
— Apeks x dennis (@denniscsgod) May 24, 2017
However it seems they definitely have not fixed the core issue for UMP. The price of the UMP means that it is still very viable to buy at the second round. The amazing high reward bonus for the kill using the UMP means that it almost always pays off for itself.