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I put it in two weeks ago. I have an iPhone 6s with Apple's leather case on it. It's too tight to fit with the iPhone 6s spacers but it fits in nicely with the 6s+ spacers. For $35 I have no complaints and it keeps the typical charging wires away (I hate clutter). It took about 10 minutes to install. Easy day.
Yep, also had it installed for a couple of weeks now. I use the iPhone 6 brackets with a 6S and leather case and is a snug fit but workable. Might have to try the 6+ spacers if you think they work better! I think it's worth it to keep it neat and stops my phone flying across my car when I find myself first car at traffic lights.