It keeps cutting out mid-use. Is it faulty?
Check the intake filter before assuming so. Air enters through a filter at the back, sitting directly behind a fan spinning at high speed in a bathroom full of airborne hair, dust and product residue. Over months, lint mats across the intake and chokes the airflow. Less air then passes over the heating element, so it runs hotter than designed, which trips the thermal cut-out: a dryer cutting out mid-use and restarting once it cools is the classic warning sign. Unplug it, remove the filter cover, pull the matted lint off, and clean the mesh with an old toothbrush. Never run it with the filter removed, since the mesh also stops long hair being drawn into the fan.
My dryer feels weaker than when I bought it. Why?
The same lint build-up described above, usually. A dryer that dies at six months has often been slowly suffocating for three: the output weakens, which feels like the motor getting tired, while the element quietly runs hotter behind the clogged intake. Cleaning the filter every few weeks prevents it; skipping it is the most common way one of these fails early.
How do I use the diffuser without ending up frizzy?
Use a low speed and a medium heat, cup sections of hair into the bowl and lift towards the scalp, hold rather than move, and resist raking fingers through it while it dries. Curls are formed by strands clumping together, and a fast, directed airstream separates those clumps, which is exactly why curly hair dried with a bare nozzle turns frizzy, and why having two speeds matters, since the low setting is the one the diffuser needs.
How do I get smooth, straight hair with the concentrator?
Point the nozzle down the hair shaft, following a brush from root to end, rather than blowing air against the direction the hair grows. Hair has a cuticle layer lying like roof tiles from root to tip, and air blown along that direction lays the cuticle flat, which is what produces shine; air blown against it lifts the cuticle and creates frizz.
Should I trust the low-radiation and diagnosis-chip claims?
Give them no weight either way when deciding. There is no established health risk from the electromagnetic fields domestic appliances produce and no regulatory standard low-radiation refers to. The diagnosis chip is not a recognised feature with any agreed definition; treat it as an ordinary thermal safety cut-out, which is a genuinely useful feature in its own right, rather than as something more sophisticated.
Will it make my hair frizzy or flat?
It depends on your hair type, and the ionic function is the reason. It releases negative ions that neutralise the static charge causing strands to repel each other and stand away from the head, which is genuinely helpful for frizz-prone and curly hair. The corollary is that reducing static also reduces volume, and with this dryer's strong airflow, fine, flat hair can end up pressed down and limp rather than frizzy. If that describes you, use the low speed, keep the dryer moving, and finish with a root-lift technique.