99% of CrossFitters will kip before using bands for volume. It's just the nature of their beast. To them, the kip is an acceptable variation on the pull up.
CrossFit is a touchy subject for a lot of people. It shouldn't be, but it is due to a variety of reasons:
1) Poor programming and coaching at select establishments due to mediocre quality control on the part of CF HQ.
2) Questionable statements and behavior from HQ, usually followed by dogmatic and irrational behavior to defend said statements.
3) The "cult-like" nature of the community.
The first is probably the most dangerous, and is the reason I always suggest to people that they shop around and try a variety of CF affiliates before joining a single one. Meet the owners, the coaches, sample their programming, find out their preferences, and then pick the one that matches you. There are some FANTASTIC gyms out there under the CF umbrella (CF New England, CF Ute), but then there are also some that think if just string together a list of obnoxious exercises and do it for time it's "CrossFit." CF should be strength AND conditioning. If you find yourself doing mostly met-cons and no serious barbell work, find a new gym.
The second is the result of groupthink. You get too many people drinking the same Kool-Aid with no counter-balance and you end up with strange behavior.
The third is easy to mock but shouldn't be. CF community is great. The people in the gyms are great, open, and welcoming. Most are just normal people who have decided to take charge of their nutrition and fitness and live better lives. They get shunned because they choose to stop eating bread and hang out with other people that lift weights, but if you ever want to make progress at anything, you must surround yourself with people who share your goals and are better than you at them. You can't be serious about your health and fitness then surround yourself with a bunch of overweight losers who would rather go to happy hour than spend an hour under a barbell. A lot of CF-ers ditch their dead weight when they join the community, and sometimes the dead weight doesn't like the fact they've been ditched, complain, and call it a cult.
When done correctly, CF is better than the majority of fitness programs on the planet and offers people a cost-effective way to train. When done poorly, it's a recipe for disaster. I think CF's biggest problem right now is that it's growing too quickly, and doesn't have a firm grip on its future or methodology. It's not the only way to get strong, fit, or healthy (despite what CFHQ might claim or think), but it's not a bad one if you do it right.
Just remember:
1) Listen to your body. Sharp pain is never good. Don't "drive through" the wrong pain. Don't be too proud to admit it's too heavy or too much.
2) Your form is always more important than the time, weight, or speed. Focus on technique and mobility and the rest will come safely.
3) You need starch to get jacked. Paleo is great for weight loss and body re-composition, but unless you want to be a lean 160-lbs, you're going to need more fat and more starch to support your muscle growth. Rich Froning and Dan Bailey are top CF athletes; neither eat Paleo. I love Paleo and follow it myself, but it's not a one-size-fits-all panacea.
4) Don't be afraid to learn from outside of CF. Mark Rippetoe, Glenn Pendlay, and many others have been lifting weights longer than many of us ever will. CF sometimes teaches some wonky or odd shit, so don't be afraid to step outside the lines and seek knowledge elsewhere.
Finally, enjoy yourself and always seek improvement.
Further reading on the topic:
http://70sbig.com/blog/2011/12/whats-the-deal-with-crossfit/
Disclosure: Author is a Level One CrossFit Trainer (CF-L1), former Army Officer, and personal trainer at a non-CF facility.