I own a Cuboid & a RX200. As from my prev post, i prefer my Cuboid over RX200 as my daily driver. In fact, mu rx200 was used less than 5 charge cycle since bought. Other than being a little bulky, tis rx200 wasn't playing nice to few of my attys sometimes. My Cuboid on d other hand performs very2 well without issue ever since i bought it. My current setup are mostly either s/steel 28g @ 0.5Ω or Kanthal claptons 28+32 @ 0.37. Got an average 250puffs or 1100sec from a pair of fully charged batts. Have married 2pairs - 2x25R & 2xHE4. Both firing w/o problem wit stat as stated.
I only have a pair of vtc4 and these r for my mech mods. Did try using on my cuboid but i dont really see any significant diff in performance compared to those 25rR's or HE4's.
If given a choice, i would get genuine vtc4's over 25R than HE4. However, genuine vtc4 is hard to get. So my next preference r samsung 25R which is easier to chk if u unwrap its skin at bottom and look for d infinity symbol. Then i rewrap.
To chk batts authenticity, 1st i would weight them and compare to spec sheet. If diff less than 1.5g from stated max weight than most likely those batts are genuine. Also look for specific tell tale signs... Eg the +ve terminal pins and other spec markings.
Cuboid max 200watts @ 0.37Ω.
So far my cuboid have no prob firing @ 0.08Ω build at 95watts using 25R or HE4. Note that these are confirmed genuine batt.
how long does your rx200 battery last? also i assume u bought long time ago,they released few of firmware update,did that fix your issues?