No, I used a Innov8 pack for a few years and really liked it. It was, at the time the most refined lumbar pack I had used. Prior to that I used (and never liked) a Wing Nut pack, that was the most distracting pack I had tried, it would ride up on steep descents and was not worth the trade off of low hanging water weight.
I was hoping to fall madly in love with the USWE, really. It reminds me of the back pain I experienced when I was new to the sport and bought my first Camelbak - Lobo. Never got along with that one either. I’m not giving up. The ride that brought on back discomfort was a long one for me (at this point). The shorter rides were more comfortable, I also think any pack requires some getting used to. It reminds me why I went pack free for so long, but it is also very nice having extra fuel, water and tools for longer solo remote rides.
Not the Chase, this discontinued pack - (apparently I was in the minority of people who liked it) Camelback Charge LR:
**Wanted to add that after really looking at the Chase, I’d like to try it. It does look similar to the USWE but with front pockets.
And the corresponding bladder:
The idea here is that the water weight is held as low as possible which for some relieves back distress. Trade offs being only zippered pocket access (little trickier to get food or tools), a bit heavier, and no jersey pocket access. Oh, and they don’t make anything similar that I have found yet. Everything is either a running vest, a USWE or knock off, or a full on hip pack (which I find the least appealing of any type of pack).