I purchased my 9500ix a few weeks ago (after lurking here for a few weeks).
I took my first road trip with the unit this weekend (Charlotte, NC to Charleston, SC) and I'm pretty impressed overall. I (possibly) had two saves:
The first one - I was on I-26 about 10 miles north of the I-95 intersection and I got a quick Ka blip on the detector. I've read enough on here and in the manual to know that Ka should be taken seriously so I quickly slowed down. As others have mentioned, I didn't get much ramp up on the 9500ix. It kinda went from a quick blip to medium strength (I use the expert meter) to full strength very quickly. BUT... I got all of that with plenty of time to slow down before I could even see them. I'd estimate that it picked up on the signal about .2 to .3 miles ahead of the State Troopers. There were two of them and they were in the median - one facing north and the other facing south. The median is full of trees except for about every few miles where there is a cut-out for "authorized vehicles only." The 9500ix picked up both signals at about the same time. I'm not sure I can really call this one a save though - I was doing 80 in a 70 and I was about four cars back in a pack and I'm sure some in the front were travelling faster than me. No one got pulled. The troopers appeared to be running C/O Ka.
The second - I think this one was truly a save. It was on the way back home yesterday (Labor Day Monday) just outside of Columbia SC on I-77 north about 6 miles from where I-77 merges with I-26. Anyway, this stretch of road has a painfully low speed limit of 60mph. Most people run around 70-80 and the cops light people up all day long. Well, I knew that I was coming up to the point where the PSL increases to 70 so I started speeding up. I was running about 77mph in a 60. I got a quick K band blip and then I got a loud "Multiple Signals Detected" and I looked up to see 2 K bands and a Ka - all at half to full strength. I hit the brakes hard and dropped to about 63 or less (it was happening fast so it's hard to have a perfect recollection). I looked up and saw a trooper on the overpass about 1,000 feet away and then I got two laser alerts back to back within 3 seconds or so - each lasting about 2-3 seconds. As I got to the overpass I saw FOUR state troopers just sitting on the side of the road ready to chase down the victims.
The stupid part is that three of the four State Troopers had their K/Ka radars on C/O and that's what I picked up to make me slow down. Otherwise the trooper on the overpass with the Laser would've nailed me before I even knew what was happening. This was clearly a save for me.
Anyway - so far so good with the 9500ix. I've turned auto-lock off and I just manually lock locations out. I do this only in spots in town (Charlotte, NC) that I know aren't high risk for me (due to driving style and the fact that police would rarely sit there looking for speeders). Like most other people I'd prefer more ramp-up on the 9500ix and possibly a longer range but for my driving style it seems to do the trick.
I don't want to turn this into a V1 versus 9500ix but I'm considering purchasing a V1 as well. I'd use it for interstate driving and my 9500ix for everyday driving. The arrows on the V1 would definitely come in handy for me and from everything I've read it's considerably more sensitive than anything else out there.