Not fit for purpose.....
Sorry Dan, but I have to stick my head above the parapet here and say that as far as I'm concerned it very definately is fit for purpose.
It allows me to file flight plans, both IFR and VFR from the comfort of my own home at a time that suits me - in exactly the same way as the old fax line did. I have templates for regular routes which can be tweaked as necessary in terms of POB or frame for the day, just like the old paper / fax system.
Admittedly, addressing VFR plans can be cumbersome, but other than that I have no real issues with the system.
I feel for the guys and gals at Heathrow FBU who always gave a sterling service, but we need to start looking more at how we can do the same things with the same level of safety and with less associated costs. Maybe in this instance it may take a little while for the 'less associated cost' to be realised.