Same case here,
the HP t730 is one of the thin / zeroclients we are looking into.
We are currently using Fujitsu L620 with 4 display ports and therfore 4x 1920*1080.
The only ThinClient we found with 4 display ports is that HP t730 and as a surprise the HP Smart Zero OS supports PcOIP as well as BLAST (we are using Horizon 7.3.2 by the way).
We experiencing differences between BLAST and PCoIP on that. So BLAST is a lot slower and has more display issues like fragments and things like that, but maybe we need to customize the values. But PCoIP on the HP t730 works as well as the former Teradici (FujitsuL620) did and as bonus there no disconnects until now, only one short Black Screen without a disconnect, so maybe this HP t730 will be our next client to replace the teradici. Forgot to mention that the t730 has graphics unit that should be used for H.264 offloading but I am unable to check if this really works.
As a common suggestion we are looking for a client that will be usable for BLAST but not only for this, we want to be as flexible as possible so more protocols supported by the client will be fine. Also a big point is the management side. We are looking for something that is simple to manage, we all do not have the resources to spend a lot of time into managing thinclients. The HP Smart Zero Services are easy, but you have no control or feedback or a database for history, it is just fire and forget. There is a HP Device Manager to achieve such functionality but it needs a lot of ports to be opened for Broadcast, Multicast and so on, which is a nightmare on a network with a lot of VLANs,
So we are still searching for something better to fill the gap with teradici.