It's been an interesting journey since I purchased my first Windows Phone. The Samsung Omnia 7 had a brilliant screen and was a joy to use. It would occasionally spontaneously restart, but I put that down to firmware/OS bugs that would be fixed in subsequent updates. Many updates later however, the problem actually got worse rather than better.
While it was away on the last of a number of visits to the service centre, I purchased a second hand (but excellent condition) HTC Mozart. A very capable phone, it was a good replacement.
Samsung finally agreed to a replacement (only after I filmed my handset rebooting – somehow they'd never managed to reproduce the problem themselves) – but by this time the Omnia 7 was no longer in stock, so I was given an Omnia W instead.
The Omnia W didn't seem quite as 'solid' as the 7 – probably the plastic case vs the 7's metal, but it worked well (and didn't spontaneously reboot like it's predecessor).
The Mozart and Omnia W have now found new homes with friends and family, and I'm enjoying my nice blue Lumia.