downside of /22 hotspot

hi there, just want to ask if what is the downside of this one

i have a ccr 1009 and i have set hotspot server to give out address on this form, 192.168.50.1/22, is there a downside or back effect on my network? we are readying for 1000 users that will use our internet, as of now we are catering 300 users, thanks

any suggestions or comments or tips will be welcome, thanks