I honestly don't get a whole lot out of fat burners. Generally I find this category of supps to be under-dosed and only mildly effective (RippedFreak, Lean EFX), and have yet to find a fat-loss agent other than OEP that has provided me drastic effects. Here's the thing - I hate cutting and I don't do it well. While I love fitness and exercise, I simply don't have the same dedication and drive when it comes to my diet. I don't eat poorly nor do I snack frequently, but I am just not good at tracking caloric intake, macros, etc.  
   
I say this only as a disclaimer that my results from fat burners are likely partially due to my habits. If you are a hardcore dieter/cardio person, you'll probably get more out of this product. Still there are products out that have caused me intense fat loss with a very minimal change in lifestyle. It is against this standard that I rate fat-burning products.  
   
DOSING:  
2 caps (1 serving) up to twice daily. For the most part I stuck with one serving in the AM with my breakfast, although I did up the dosage to 3-4 caps daily towards the end of the bottle.  
   
EFFECTIVENESS: 7.1/10  
For me FatSmack XR was slightly better than most burners I've tried, yet still provided only marginal weight control benefits. I did notice some slight leaning out while on FatSmack, but no true fat loss (at least nothing marked). I will say I gained some excellent muscle mass during my run of this product without putting on any additional fat. With that in mind, I do feel FatSmack worked well as a supportive supplement in my recomping efforts.  
   
As for immediate effects, I didn't feel anything from this product. No thermogenic effects, no appetite suppression, no elevated heart rate, etc. I also didn't have any negative side effects that I've experienced from other products i.e. jitters, nausea, coldness, racing heart, nor did I have any issues with a burning throat that some other loggers reported. Put it this way, there were some days when I couldn't remember whether or not I had dosed the product.  
   
Weirdly the biggest benefit I got from FatSmack was joint relief, which is likely due to the product containing 300mg of Cissus quadrangularis per 2 caps. Though a smaller dose, I definitely noticed less stress/recovery time for my joints. I didn't even realize the product was providing this benefit until I finished the bottle and starting experiencing some delayed soreness and tenderness in various joints/ligaments. A nice ingredient bonus from Purus Labs.  
   
VALUE: 8.5/10  
True to form, Purus makes sure FatSmack XR has a solid price point. A 90 cap bottle (45 servings) is going to cost you roughly $28 or .62c per serving. Considering the overall profile of the product, $28 is a good value. In comparison to other similar burners, FatSmack is generally less expensive or extremely comparable in price.  
   
OVERALL: 7.6/10  
If you respond well to burners and are looking for a new product from a sound company, absolutely check out Fat Smack XR. While I personally didn't get much out of the "extended release" caffeine profile, I do feel that stim-sensitive or more diet-strict individuals will have greater experiences with this product. Overall Purus Labs is bringing a solid supplement to the table and, though it wasn't one of my favorites, I still recommend it as being a well-rounded, well-priced supplement for any fat-loss stack.

I just finished my first bottle of fat smack and it was okay. It was nothing like lipo 6. This stuff wasnt over powering at all, and I did not crash from the energy boost. I took the reccomended dosing of it and I didnt lose any weight by the scale, but I do look a lot leaner in the mirror.

Fat smack worked really well. I lost almost 4% body fat in 5 weeks. But I have been hitting the gym 5 times a day. The first time I took the pills I had an extreme energy rush. But I think your body builds a tolerance to this stuff, because towards the end the energy was a lot less, although it still raised my body tempature.  
 

I love fat smack. I got a nice surge of energy from it, without the jitters, dry mouth, and other uncomfterble side effects. This product was super clean and not overpowering. The standout effect for me was my metabolism went through the roof!  
 
Although I have to say that I think that im building a tolerance, but thats okay since im only using it for my cutting phases, so the tolerance will go away in over the next few months.