Just saying, in my opinion, once installed, if having trouble, both Rythmik and PSA are going be there for you. It's not like either owner is going abandon you in your hour of subwoofer need.
With that in mind, based on all I've read here and from personal phone experience, PSA, Rythmik and SVS, consistently have risen, equally to the top. I'm not knocking anybody's product if their name is glaringly left off the above. These are my personal impressions as to these three manufactures.
Allow me to encourage, if wanting the F25, please, pursuit it further if that's the sub you really want. Don't let a misstep on an employee's part, put you off getting what you want. The good news, no matter whom you go with, Rythmik, PSA or SVS, my internet based impression, based on countless comments, you're going love what you hear.
The caveat, always buy more then you think you need. The common complaint that I read, "I want more." I "NEVER" read; "this thing is garbage and I wasted my money." They all have return policies and having to pay for returns, considering the size and weight of these boxes, is a normal and reasonably expected part of this process.
Customer service concerns aside, what hesitation do you have?