Two days ago I made my first flight with the 727 CS in FSX, I never done before for performance meaning. I really enjoy it, I used the civia all along the route from KMEM to KMIA and at the end I was vectored form ATC to land safely on rwy 26L.
I had to say that KMIA is hard in framerate even on default scenery, I got around 10-12 in framerate at the arrival wich was annoyng.
I used also as backup vasFMC just in case that atc ask for particular procedure where  FIX can be hard to find with vor navigation.
I used Vasfmc also in a couple of flight offline without any problem I just active HDG SEL on the 727 autopilot and active AP couple in VAsFMC and it follow nicely the route.
If you have a good and powerfull PC with a lot's of ram I think should be fine and other area in FSX are more FPS friendly then florida.
Have fun on the 727 office and see you up in the vatsim sky

Edwin,

I've seen the disussion on the Dutch vacc forum. My opinion is really different from those people.
You can perfetly fly this beauty on the VATSIM network.
Just file VOR's or airways with VOR's in it. If this is  not possible beause of complaining controllers  , just use VAS FMC, which is really handy!

Gr
Sam

Controllers really should not be dictating to you what kind of equipment your aircraft should or should not have.  The reality is that aircraft like the 707 and 727 are very popular in the Flight Sim community, and most controllers I've come across are going to be very understanding.  I used to fly the 727 regularly online for a virtual airline and had no problems.

However, it should be noted that it's perfectly possible to fly the same kind of routes that FMC-equipped modern aircraft fly with the equipment the 707 and 727 have.  All you need is the VOR and the DME and a chart, all an intersection is is the point where two radials from a VOR intersect.

So, basically, even if controllers give you guff about flying VOR to VOR, the only thing limiting you flying the same route as a 737NG is your own ability.  Get a chart, and start practicing flying to intersections.  It's not that hard, and you'll actually be flying like a real pilot, instead of just being a button pusher!