I've had several wraps over the years (10+). Usually I do one before a vacation or special event. I have also done home wraps. The pro wraps generally worked better because they can wrap you tighter and more evenly than you can wrap yourself.
My first wrap was the most dramatic and I've had varying results, but most places will guarantee a loss of 2.5" minimum. Just be sure to watch time measure so they don't fudge it. I have used warps to fit into a dress that I didn't quite fit into, look better at the beach, etc.
I've always had results that were worth it. If you wear tight jeans you can feel the difference afterwards. Warps work best on people who retain water. For me, they last about 3 months. I have never been good at drinking water so you may have longer-lasting results if you drink plenty of fluids.