I have not tried the headlamp that OP refers to but i have several other low budget headlamps from DX and might give each of them a short review:
First off is the cheapest; SKU: 12924 : This is a good lightweight lamp for under 6 usd. It has 3 settings: high, low and red.
The light pattern gives both good throw and flood and the build quality seems ok. For the money this is a good light. I have several og these and lend the to friends who are going caving with me and dont have a light of their own. In caves the low setting is sufficent unless you are in a big hall.
Downside imho is the AAA batteries; i prefer AA.
Next up is the SKU: 29435; This is a part for part copy/clone/knock-off og the led lenser H7. The only differences i have noticed is; the wires from batterypack to led is flimsier than the original, the headband is of somewhat cheaper quality and the lightpattern is a tad more messy than the original. The light was actually more white than the original wich had a slightly bluer tint. Also a good buy imho if you like the H7. (which i do).
For those that are not familiar with the H7: it is a direct driven light with a potmeter (stepless) dimmer and a good flood to throw function. Uses 3xAAA.
Moving on to the SKU: 32878; like the previous light this is also a 3xAAA with flood to throw. The flood is narrower than on the H7-copy so you get a somewhat narrower field of view. But the light is good and even. It has 3 modes: Hi > Mid > Fast Strobe. They sell these locally at the hardwarestore and they are used by several cavers in the area because of the good light vs price ratio.
And the final light in this review is the SKU: 102061: This is the same light as the previous only with 4 small differences:
1: it uses AA instead of AAA

2: it has strap that goes on top of you head in adition to the headband (this can easily be removed if it is not your cup of tea)
3: it has a weak red diode on the batterypack which makes it easier for cavers behind you to see you from.....behind...
4: (and this is the strange part): it is 4.32usd CHEAPER than the AAA version and costs only 8.60. Gonna get more of these.
Btw: there is also a 18650 version of this light for about 13usd for those who prefer that.
Hope someone finds this post somewhat informative and cares to leave a comment