I have to say, i've had experiences with other DAWs, and I always come back to Cubase as my go-to DAW, I'm so fluent in it's work-flow and know all the shortcuts to get what I need done. There is only one thing I desire from another DAW to be integrated into Cubase as an additional feature, and that is a single window layout like logic / studio one, but Cubase 7 has countered that desire with a smarter window behavior.
I've spent the last few days, ~28 hours on a single project and have not had a single crash, show-stoppers or crazy-ness occur, Cubase's reliability it's been this way for me since Cubase 5.
For me, I compose and record in Cubase, I use some outboard synths/FX and only a handful of VSTi & VST-fx plug-ins, some via jBridge, Cubase is more reliable than I can ever remember. There are odd issues sometimes but I find they are usually the host system causing them but I will say, I'm kinda happy there were some bad times in Cubase history for bugginess (CubaseSX 3 was the worst, IMO) , that is how I developed OCD for saving my projects constantly, and making backups of them too. So I rarely ever lose a performance due to a Cubase bug.
My advice to anyone prospectively looking to upgrade is to go ahead, you can always finish your current projects on an older version along side the newer version until you really get it setup with your prefs and give it a good shakedown with all your plug-ins and drivers etc.
The Workstation- Z77MX-D3H, i53570k, 32GB DDR3, 240GB SSD, 2TB HDD, RME AIO, Windows 8 Pro, Cubase SX-7.5, Reason 6.5 + RDK 2.0, Kore 2, Komplete 5-6, Arturia V Collection, Halion Sonic 2, Halion Symphonic Orchestra, Analogue Drums, Eleven Rack, Yamaha 01X, Access Virus KB, Nektar Panorama P6, CMC-QC, Presonus FaderPort, RME Babyface, Yamaha HS50M monitors.