Yes, I had a look at the EV, which I really liked, and came very very close to buying. I agonized about it, and in the end decided to purchase the Sub 1 - but you discovered some of the same issues I experienced.
The factors I considered were:
1. The Behringer B1200D was less than half the price, but I agree, Sub 1 seemed to have better low end accuracy. Less boom and more tight feeling, not really much louder, but more punch when needed.
2. The EV ELX200-12SP was $200 more, and was more powerful than Sub 1. The specs seem to confirm this with 1200W and 129dB SPL/1m. But the Sub 1 was 3kg lighter and easier to carry suitcase profile, and frequency response seemed smoother. The EV power may have also been wasted on the S1 Pro and my modest Yamaha Stagepas 600BT top boxes and powered mixer - which is only about 680w total
3. Technically, the S1 Pro is a better match to the Sub 1 if the source is connected to the Sub 1 first, and the Sub 1 sends the higher frequencies to the S1 Pro. But in reality, most ppl use the S1 Pro as the source, and the HPF feature is sadly bypassed and becomes useless. If BOSE engineers could update S1 Pro firmware to simulate a Sub 1 HPF type connection, then this would create a new market category set up - eg most compact "in between" setup
In summary:
S1 Pro alone --> Fantastic small setup for up to 50 ppl - use inbuilt mixer for two mics and blue tooth backing track. Very happy.
S1 Pro Sub 1 --> ok for up to 100 ppl, but has HPF problem when using S1 Pro as source. Low frequencies are duplicated and muddy compared to normal HPF setup.
Yamaha Stagpas 600BT S1 pro (monitor out) Bose Sub1 (sub out) up to 200ppl --> A great sounding light medium set up for musicians. ( not for EDM) The Stagpas mixer board manages LPF to the Sub 1 with "sub out", and "monitor out" to the S1 pro. Super Happy - every thing is balanced and clear.
Comments Welcome - like most musicians, I cant afford to have duplicated equipment for various venue sizes, but would like to add what I need, only as i need it, from what I have loaded in the car. lol