good choose. we are using srx3600 with a full chasis and it is just a bull of sh..
juniper knows the bugs , errors and they always request money for their mistakes and helps and also this is not a valuable device.
Small pps is a big problem on srx all series
UDP is not solvable on attacks
vlan not supported well
firewall options are limited with cpus catalog values not correct
....
thousand of reason for select
riorey
arbor
fortigate
etc