I have never used the SDR-IP locally, although I have used it via remotes. I have used the QS1R and the NetSDR, and the NetSDR and SDR-IP performance should be very similar, with some features variation.
The QS1R is more of a tinkerers SDR. It has great potential but needs a little tweaking to get the most out of it. I prefer the NetSDR to the QS1R.
T!