I owned a pair of SC-IVs for almost five years before replacing them with Revel Ultima Studios. At the time, the swap was driven mainly by a complete speaker “solution” offered by Revel, as I was converting a listening room into a home theater. Sonically, the performances of the two speakers were very close and both quite satisfying.
I would take to heart the warning others have made about the likely age of the SC-IVs. Over time, certain mechanical and electrical aspects of a speaker can degrade, making their perfect repair a real nightmare.