Let's not get carried away
I'm sure the Bryston/StormAudio unit is a good, or really good SSP but it falls short spec wise to the Trinnov Altitude32 platform when it comes to overall fidelity and even the Altitude16, Daatsat LS10 and Theta Casablanca. If you are only concerned with running movies through it then fine, the 48/24 limitation of the Bryston/Storm units are not a limitation at all but if you are running through high res music or concert Blu-rays with 96/24 sound tracks the SP4 down samples that to it's internal 48/24 resolution then it gets upsampled back at the DAC stage. Far from ideal.
I know there is talk of a Bryston module allowing for higher resolution in the future but I suspect that will be 2 channel only, possibly only a bypass module of sorts not allowing Dirac, post processing etc. to be applied at higher resolution. If the units go to 96/24 (192/24 highly unlikely) in the future I believe that has to be a change on the StormAudio end because Dirac needs to run at those resolutions as does everything else internally. Not a simple change at all.
The Trinnov on the other hand can handle 192/24 internally up to 24 channels I believe then 96/24 up to it's 32 channel count. OK sure, it's a lot more expensive so lets look elsewhere, the Altitude16 can run internally at 96/24 and the Datasat LS10 can do the same and both are much more comparable to the SP4 in price. At the moment I still haven't received confirmation of the internal resolution of the Emotiva RMC-1 which is also using Dirac. The Theta Casablanca can as well but it's very pricey like the Altitude32. If channel count is a big concern then these may not meet the needs of everyone because they are all capped at 16 channels unlike the Altitude32 and StormAudio's own SSP's. I'm not sure if Bryston is offering any of the StormAudio 32 channel units but even if they are all of the units are capped at 48/24.
I believe it's unclear presently if Dirac can even run at 192/24, well at least in SSP's which are all using DSP chips. I suspect it probably can on a PC though. What allows Trinnov to run their EQ at those resolutions it is it uses an Intel chip not a DSP.
If the Bryston/StormAudio units were doing 96/24 I would already own one as I don't currently or in the future see a need for more than 16 channels plus I can't afford even the Altitude32 8-16. There is no Datasat dealers even remotely near where I live so that's why I haven't gone that direction. Like with the Altitude32 I can't afford Theta's Casablanca and for some reason here in Canada the Altitude16 isn't much cheaper than the 32 8-16 which is unfortunate as I have a Trinnov retailer just up the street.