For those using slimq 150watt with adapter

I heard this is a great alternative to the 200 watt bulky adapter included with the system. I've never used adapters with lower wattage than the standard that is included for DC inputs. Are there any downsides to feeding the device 150 watts vs 200 watts via it's DC input other than slower charging? Basically there shouldn't be any potential for damaging the device sending a lower wattage through DC right?