An update on my Response (Rory H):

The Drilling is 50 x 4.25 x 40. (PAP 4.75 Up .25)  There is nearly (I say nearly, cuz I think its 59/64 or something like that) 1 inch hole about 3" deep in between P2 and P3.  I wanted to experiment a little more before I put the balance hole in, but due finger weight and side weight left, it somewhat restricted me with the press that I have at my house (without altering the press height, etc..something I am not to keen on changing.)

Anywho, the details:

On a burnt up house shot that I basically use as the test ground with no drive on scoring, but more on just understanding my equipment.
House- Wood
Oil- Kegel (either Infinity or their latest)
Freshly resurfaced surface
Lane Machine- ION

I found this ball OOB to allow me to start a little farther to the right than I expected, but most of this is due to the type of lane machine and the amount of oil that is down lane and the lack of taper in the pattern.  It was easy to see that the front part of the lane was mostly toast.  However, this ball easily made it through the front and allowed me to get it to where I needed to have the ball walk in to the pocket.

I after throwing a few frames my initial reaction is to adjust to the surface of the ball to 2000 (or 1000) because I like to throw a little harder and have moderate revs 345-360.  Since I am in league play, I cannot (or should not do that) so I searched around and found a nice line for a 267.  The ironic part about where I was playing, was the week before, on the Fresh shot (because teams did not hit that pair in the first shift) I threw the exact same line with my N'tense (with a similar drilling) and shot 748 for a series.

At 4000 (and a drilling similar to mine) you may run into issues controlling breakpoint on a fresh condition when too much oil is on the lane.  However, that is what an N'Tense is for.  IMO, you can pretty much do whatever you wish to get this ball to fit in your bag. Whether it be a different drilling, surface adjustment, both, neither..lol... it can work.

I also threw this ball on a Kegel Challenge league on their 45 foot pattern.  Personally, I knew I had the wrong match up, but stuck with it any way.  I shot 622 or something like that.  Seriously, who would throw a ball at 4000 OOB, drilled somewhat flippy, and think that is a good idea.  Nevertheless, the ball handled the Infinity Oil applied by and ION on New Brunswick ProLane quite nicely.  This also verified my personal opinion that I need to lower the surface on the ball to 2000 grit.  However, even OOB finish proved to still keep you close.

Sorry for the long reply...but-

So basically, it appears to me the ranking would go:
N'tense
Response
Solid or N'sane (depends on your set up)
Mojave

Keep in mind that the Response is 4000 OOB, the N'Tense is 1000 OOB.  I just punched up my Response yesterday and managed to throw a game or 2 last night  on a second shift shot.  I plan on getting some games in tonight on fresh, so I will provide a comparison with my N'Sane.  My initial impression so far is that the ball has a similar reaction shape as my N'Sane, but is several boards stronger in the back.  Both balls have the pin just above and to the right of the ring finger (approx 1 0'clock), and the cg just to the right of the center of my span. No weight holes in either ball, although I am toying with potentially adding a gradient line balance hole to the Response.  I will evaluate that decision after I bowl a few games on a fresh shot where I can get a better read on the balls reaction.  To be continued....