Hi, I had this, this after some time, this annoys you. Because it feels and it is bigger with the bumper. My bumper was a little thinner, but the same effect
I use a similar version, with a cover on the back and this reduce the RF signals (BT, Wifi, Celullar, etc.). If I can recommend something, use another like the "love mei" to fully protect your phone.
I have one at the moment, bought it for 6 dollars . Actually it makes the phone bigger and less comfortable, also you wont be able to use the fingerprint scanner, because the power button will be about 6mm inside the bumper. It's edges are not soft. Buy a silicone backcover.
You should look into DevilCase. They make great bumpers which I've been using for years. Very high quality and doesn't affect cell service. They also make really cool skins but since they're not sold in the USA, the shipping is awfully expensive.
I used an aluminium bumper with a slide on back as a posed to screw together ones. I dropped my device a couple of times and thought it was fine, although the it turned out the frame bumper had warped causing the back slide in section to not sit correctly. The impact also caused the rear glass to smash in a corner which I didn't see until I removed it.
Despite my previous opinion, I am using DevilCase since few months, and I can say only - The phone looks gorgeous!
Well it is slippery (like it is naked), but there is some protection (i dropped it around 10 times without any damage to the phone or the bumper).
Insignificant signal degradation (in my environment - home, office).