A power conditioner is one of those boring, grown-up purchases that everyone needs to make. It serves nothing towards your creativity or skills, nor does it have any interesting functions. But its among the most important purchases to be made in your studio. To make a comparison, a power conditioner is to your gear what insurance and regular maintenance is to your car. It isn't exactly a fun buy, and hopefully never necessary, but It has your back when you need it. Furman makes an exceptional product.
I have three of these (European 230v model) in my studio racks. Absolutely essential. Provides isolation against ground loops and protection against power spikes, which happen frequently here in Thailand.