My band has been rehearsing here for over a year, and we love it. We used to rehearse at Musician's Choice--a dive in Tempe where the equipment doesn't work and the guy at the front is too distracted by porn and pot to be bothered to assist with it. At SER, everyone is helpful and incredibly nice. The studios are clean, the air conditioners feel great, and best of all, the equipment WORKS. The pricing is also fantastic, especially if you schedule on a weekend or weekdays from 11 am - 5 pm, when they have special rates half those of the regular rates.
We've also recorded here, and, while things went smoothly and the end result sounded great, we haven't recorded anywhere else except our garage, so I can't fairly rate that. But I can say we'll be back!
SER is open seven days a week. They also except credit/debit cards, so you don't have to run to an ATM to pay for a session (I'm looking at you, Musician's Choice!). The location can be hard to find the first time you go, but just print off some directions and you'll be good to go.