I used this method for a few years then stopped , as said it is a faff .
Although i have recently set up a downstairs pole again , it only gets used on certain stuff like runs of terraced houses , i go through all the tops and swap poles and then do the downs.
Also it comes out on the larger properties with connies and the like , but as a rule if its straight forward 3 bedders its an 18 SLX all the way round .
Look at the type of work you have , that is key to if you need it or not , handy to have though either way .