Hey all, I've heard this reported, but since Modern Vapor was kind enough to send me some carts to try, I can now confirm firsthand: the cartridges for the Sidesho are NOT compatible with the blu atomizer.
The mouthpieces are pretty much identical, but the inner cart of the Sidesho is about twice as long as that of the blu, and therefore there isn't enough room for the blu atomizer's wick.
One nice thing, though: since the mouthpieces are the same size, you can order blank Sidesho carts and replace the inner cartridges with blu ones, if you're interested in adding new colors for the blu. In addition to blu's tan, black, and white, the Sidesho carts are available in blue and pink. Possibly useful if you like to color-code your flavors, like me.
For now, I still find that the best option for the blu is to refill the carts that come with the starter kit (25 carts should last a darn long time), especially if you replace the filling with PET via the Lipton Pyramid tea bag mod, which yields MUCH better performance. Since the pack carries six cartridgesfive in the holders and one in the blu cigif you have a total of six atomizers, you can attach those to the refilled carts and you don't need to cap them any other way. Extra blu atomizers are only $10 for a pair, with free shipping, so I've found having six total to be well worth it.
(There is also the option of buying blank 306A carts and 306A atomizers, but they're slightly more expensive, and after a couple of weeks, I still haven't noticed any improvement with those over the blu ones while using PET filling and the same liquid. Your mileage may vary.)
The mouthpieces are pretty much identical, but the inner cart of the Sidesho is about twice as long as that of the blu, and therefore there isn't enough room for the blu atomizer's wick.
One nice thing, though: since the mouthpieces are the same size, you can order blank Sidesho carts and replace the inner cartridges with blu ones, if you're interested in adding new colors for the blu. In addition to blu's tan, black, and white, the Sidesho carts are available in blue and pink. Possibly useful if you like to color-code your flavors, like me.
For now, I still find that the best option for the blu is to refill the carts that come with the starter kit (25 carts should last a darn long time), especially if you replace the filling with PET via the Lipton Pyramid tea bag mod, which yields MUCH better performance. Since the pack carries six cartridgesfive in the holders and one in the blu cigif you have a total of six atomizers, you can attach those to the refilled carts and you don't need to cap them any other way. Extra blu atomizers are only $10 for a pair, with free shipping, so I've found having six total to be well worth it.
(There is also the option of buying blank 306A carts and 306A atomizers, but they're slightly more expensive, and after a couple of weeks, I still haven't noticed any improvement with those over the blu ones while using PET filling and the same liquid. Your mileage may vary.)
