In fact, I also think, it would be better if SPR was CPU only coin. But it is absolutely not trivial to design algorithm, which will perform well on CPU and contrarily on GPU.
In the meantime, it is really necessary to keap pace with "secret" GPU miners, to make powers equal and fair.
Then it's vulnerable to botnets.
Botnets prefer using pools/mines. SPR is quite secure from that - you need the whole blockchain downloaded and wallet started. Probably this is why currently there are no SPR botnets while SPR has a good price at the exchange.
I see good future for SPR as the best CPU coin. When it will become true GPU coin I will quit
