Wow... Lot's of different opinions on this subject...
Please let me reiterate, I preempted my post with "It is my opinion". I respect all of your opinions, so please just try to tolerate my opinion if at all possible. Just passing on what I've learned to new vapors...And, let me be clear; I am talking about the Visions Ego LR Clearomizer only.
Oh... before I forget... TRACKER II- It's your money; I could care less about you and/or how you spend your money.
I can't speak to cracking issues because I haven't experienced any on my Visions Ego LR Clearomizer yet. I can tell you than most other issues discussed in this thread can be resolved with with a slight bit of mechanical ability and by keeping an open mind.
Here's an example. My co-worker tried the Visions Clearomizer today and told me they suck. He told me that before it totally failed, the flavor was muted. He went on to say that "then the thing just died for no reason". I took a look and here is what I found- the flavor was muted because he had his drip tip cranked down so hard that it crimped the wick; not allowing juice to make it's way to the atty. And guess what? His juice was filled to the very brim, which flooded the atty. I handed him a fresh clearomizer, filled and primed it properly, then GENTLY turned the drip tip down until it just barely contacted the rubber cap. He fired it up and was amazed! From junk to amazing- just by keeping an open mind and by taking direction.
I've read that cracking issues may have been resolved on these things, but the jury is out for the time being. In the mean while, if you are experiencing issues with the Visions clearomizer (other than cracks), here are my recommendations to resolve, and here is what I do:
I never fill past 1.4 ml's; never run below .7 ml's (to prevent flooding/dry burn)
I fill (never down the center hole), then lay it horizontally for 10 minutes to prime the wick
I try to leave it laying horizontally when ever I can, so the wick doesn't get dry
I keep the atomizer centered in the unit- When refilling, I reposition if necessary
I do not over-tighten the screw-in drip dip; doing so will crimp the wick; restricting it's wicking properties
I shake often- the clearomizer has a tendency to burn off lighter particles of juice, leaving heavy particles behind. Some people complain the taste goes down-hill as the tank empties. Shaking occasionally eliminates this for me
After every two tanks or so, I simply rinse it out with cold water, shake it out, refill, and vape- it takes a few minutes for the fresh juice to displace the water in the wick- but it's not a big deal.
Lastly, I didn't quit smoking cigarettes to get sick. I don't like the idea of inhaling burnt poly filler material, but feel free to do so if you like. I don't claim to be a health expert, but vaporized plastic coating the lining of my lungs doesn't sound like a "heathy option" for me.
God bless and good night