I have a Babylock Crown Jewel with a Qbot and I love it!
The only issues I've had have been thread breaking a couple of times. But usually that's because I set the machine to go too fast on the Qbot (above 100% can be too fast on some designs), and once because I forgot to adjust the tension when using metallic thread. But it always sews like a dream and works great with my Qbot.
If I had it to do again I'd still get the same machine. And I guess it depends on where you live as to whether the HQ Avante or the Crown Jewel is the less expensive of the 2. I love them both (since they're the same machine) but this one saved me like $1,000 with the deal I got on it. Good luck finding the right machine for you!