Just killed the dynacup after 4 days of abuse.
Pros:
Lasted 4 days, 50+ caps, 2-4 hits per cap.
Upside down button to help you use natively on waterpipes
Replaceable batteries, but not 100% portable when doing so
Stealth factor
Custom glass tube stem
BMS on board
Easy to see power level button
Solder connections look good, wires had heat shrink covering crimps etc
Cons:
Build material/quality is like a 8/10
The ih components is glued to the insides of the cup.
Battery compartment is kinda small, you hafta dig your fingers into the 18650 to get them out - I charge mine externally but the onboard BMS allows you to charge in cup, however forces you to plug it into the ac wall adapter when swapping batteries, to get it to reset the bms for it to function.
I dislike the buttons, they feel janky, not really bad but like a somewhat below avg engagement feeling imo.
The blue led to signify the power/switch is on is buried in the glass tube, it is not very visible at all, stealthy it is but impossible to see when I am pulsing.
Cup screws together just ok, all it is doing is hiding the batteries with like less then 180degree turn, its hollow enough that you can squeeze hard enough to always get this slight loose feeling (since its 2 pieces of plastic and your compressing them)
Owning 4 diff IH (Vhb, Caldron, Apollo2), this is the king, nice long heatup cycles, easy to use on water piece with 2nd activation switch, long battery life, stealth factor and price.
I will probably sell the vhb and apollo2 now and just go dynacup and caldron