It really depends on what type of SW
setup you want. For a reef no they are not the best. For a FO
or even a FOWLR
they can work. Personally I would use high grade carbon and some sort of floss/pad to remove large particles. Keeping up on maintenance and possible a 2nd filter would be good until you have enough LR
or other biological filtration. Everybody will have an opion. fact is not everyone can have a sump/fuge reight away and the requied amount of LR
I started my 75g as a FO
witha 350 mag and a hot mag cansiter filters. 3 + yrs later it has transformed into a 90g reef with a DIY sump/fuge.
Tell us what you hope to accomplish and we can better advise. Better yet, update your :my info" section and describe your setup. Include things like filtration lighting, inhabitants substrate etc.