I have a Bernina serger which I've had for two years. I have made a ton of pillowcases for cancer kids with it. I have not quilted with it but my Bernina dealer does offer a class on piecing a quilt on a serger. Have worked on one blouse with it too. I'm not much into sewing clothing like I was when my kids were young. I love my serger and wonder what I did without it for so many years.
My advice is to get a serger that is the best you can afford from a dealer who is close to you so you can take guide classes and have a support team and for service calls.