Is NTM still relevant?

I inherited this environment recently, so forgive me if this is a stupid question.  Is Network Topology Mapper (NTM) still a relevant stand alone product if you also have Network Performance Monitor (NPM)?  If NPM and can poll for topology and and then include that in an Orion Map, is there any reason to run NTM seperately?  We have an SLX license for NPM, but also a license for NTM and I'm just trying to figure if there is any incentive to continue paying maintenance on NTM.  Thanks in advance.