REL is a great choice. Easy to integrate, the G2 has a remote. Depending on your room size you may want to explore a 2nd G2 down the road.
Every proponent of REL always says they are musical. I've had REL Storm, B1, and newer R 'serie'. I've also had Velodyne FSR-12 and DD12. I have had a VMPS Larger sub. I have had JL E112. Movies? Velodyne or JL. Music? REL, absolutely. If you research, the criticism of REL is that they do not go down that low with much power compared to the competition. It doesn't matter, they are able to couple with the speakers and the room such that the musical experience is that much more realistic and enjoyable. Even as an organ aficionado, I would rather have the strengths of the REL against the strengths of the others. The VMPS? This is a true sub bass woofer. It moves air. There is no replacement for displacement, as they say ! The VMPS are great if you have the time and wherewithal to set them up properly, but in my opinion they are slightly slower than the others. But the bass they produce is prodigious. I have not heard the REL G series. Lastly, the accuracy of the Velodynes and adjustability is great, and if I had to live with one I would be OK with that. The RELs are harder to set up, and if you have strong room nodes they can be tough at that frequency. But overall I like the REL.
Thank you all for your input. I apologize for the delay in my reply but it took quite a while for my question to be posted and I initially thought it hadn't gone through.
Anyways, I agree the G2 from a financial standpoint is overkill for the system but I was looking to pick up a used one. The ease of integration and ability to match the speed of my Devores (woofer is only 5") is the key for me. My understanding is that a 10" driver paired with the power the G2 comes with should make that possible. Another option is to get two R-218 which is also a sealed box wih 10" driver but it has nowhere the same power. Any thoughts?
Vladimir, thanks for the tip re: S series, will definitely look into it.
I know of no reason why a REL would be any easier to integrate than any other sub. The issues are the same regardless of the particular sub.
I also don't know why a REL would be perceived as being any "faster" (really no such thing) than any other sub. REL tends to have very good group delay specs, but many subs are below the accepted 1 cycle threshold.
From the measurements I've seen, REL subs roll off the high end somewhat early. That's not surprising since they are designed to be mated with full range speakers. That may be an issue with your 5" driver main speakers.