User blog comment:Alartan/Swiftness or Mobility boots?/@comment-25003900-20150203162951/@comment-24590723-20150205222943

Price is problem here.

If particular champion can buy BoM he should. Unless, one will probably chose mercury or tabi. True.

I like Swiftness on Volibear or Rammus. They can five into enemy team and catch carry without any means for enemies to prevent it.

Amumu can use BoS for better ult or to get sticky with w and e.

IMO Nasus needs that 15 MS. I like to have a lot of % boosts (r&m, trinity). With that he can catch carries successfully.

Skarner doesn't need BoS that much. He has ult, slow and speed.

My point was to advise people to not blindly buy BoM. Especially with those proposed items. I did not discussed other choices.