rifled shotgun choke tubes?

[newB]

Had a discussion with a friend regarding rifled choke tubes. From experiance when using sabots rifling needs to be used to stabalized the bullet. I suggested that he look into a rifled tube, when he went to GM to get one the shop guy said it wasnt worth the money ($30). So he didnt. Ive shot standard slugs and sabots from the same gun with a rifled tube. The sabots shot about 8-10 inches higher at 50 yd. than the slugs. Wondering if my advise was a waste or the other guy didnt know what he was talking about? I also came across a choke tube that said it was designed for sabots, whats that about?