I agree, always crosscheck with DTGx3. Often you can encounter a tailwind in the descent that is not accounted for in your OFP's descent winds. Personally I like to visualise things and I put a 10nm ring and 30nm ring around the intended landing runway. Depending on the direction I come from, I either select the RW or the FAF/FAP with crossing altitude in the descent page to get Vertical Bearing information. It's a great tool but not many use it.