Pygar Standish

After Havok 4 the amount of prims a sim could handle went way up and the lindens changed their stance on them from "not at all" to "ok, if used sparingly". You can use them, just don't go nuts with the amount of them you have or the objects you try to rez with them. Myself, I almost always have one on my land...I find them the most practical for things that are kinda optional and more for show than anything (statues and fountains). If you use them there are "brands" of temp rezzers that shut off when you aren't in the area, which makes it less likely you'l bother your neighbors with them.