I've had this case for about 3 months now. I bought the bike mount kit too. I find that I use this case most of the time now and actually like it a lot. The microphone volume isn't good, but I've never had anyone tell me they couldn't hear me. However, I use my bluetooth headset most of the time.
The primary reason I didn't go with the RedPepper was that I need a belt holster. I don't ever carry my phone in my pocket. I like the mounting system to my mountain bike as well.
The case is pretty big so get ready for more stares at that huge thing, especially since I put it on my belt (work environment is easier on belt than in the pocket).
The negatives are that given the huge size, I wish there was a float attachment either via lanyard or onto the OBEX mounting system on the back of the phone. If you drop it in the lake, good bye phone. It might even stay dry, but you are going to have to go after it if you want it back. The other thing is that I have several spare batteries for frequently international travel use. Changing the battery on this case is not something you want to do often. In fact, I don't travel with my phone in this case because of the difficulty opening the case. Yes, I know that's probably by design to some degree, but if you need to take your phone in and out of the case, don't even order this one.
Regrets...Not really. If you need/want the multiple mounting options and belt holster then this is for you. If you just want belt holster, I might recommend the beast of the Zero Lemon unless you are near a charger often. The RedPepper just didn't appeal to me. Why not make a belt holster? I'm sure someone will tell me XYZ holster will hold the RedPepper case or even that RedPepper has a case and I'm just a bone head who missed it.
All in all, I've used Seidio since my Nexus One. I've had cheap cases in the past, but have never had any problems with quality on the Seidio cases. When my Note3 isn't in the Obex, it is in the Dilex. I also have the surface for suit and tie meetings. I never go without a case on any phone or tablet...