I use small drones all under 4s 1000mah with xt30, this charger seemed interesting to me: toolkitrc m4q, what do you think of someone who uses it?

Seems more than fine for batteries of that size without maxing out the total wattage. Now if you ever move to larger 6s batteries it may be on the weak side if you intend to power it via AC but on DC you'd likely have plenty of power.