I own an Expobar Office semi-auto. Have done for a little over three and a half years. I have been quite happy with it. Not as well finished as some of the Italians, well maybe all the Italians. I was initially considering a Silvia, but made the jump to a HX instead. For me I couldnt have justified going higher up the food chain (budget wise), but have been happy with the coffee I have been able to produce with it. Like all machines it has its idiosyncrasies. I have found it noisier than Giotto and other machines that I have played around with. Probably a bigger cooling flush than other machines I have played with as well, though not all. I am in the process of weighing up doing some modifications.
There are some Oscar owners around as well, so I am sure you will be able to get some firsthand opinions on them as well. Best thing is to play around with machines at a sponsors premises, so you can compare them head-to-head. The new WA sponsor may be able to help you there.
If I had a bigger budget I probably would have gone a different brand at the time. But I have been happy enough with my choice, to the point where I have chosen to upgrade grinders instead.
If you have any direct questions about the Expobar then fire away, others will probably be able to help as well.