Whilst I don't disagree with what most people say here about the MFT3, I do have the older MFT 1080 and wouldn't want to be without it, personally. It's workshop-based (too heavy and clunky to move around conveniently, and too big for most of the houses I work in - like Chippy above and many other's I'm sure, I have my own home-made solution for job-sites) and built into a run of workbench so very solid.
Not sure if I mentioned it in this thread or another, but mine replaced an old RAS that was 90% of the time just taking up space in the middle of the bench; being able to simply lift the rail up out of the way and have a clear run of workbench is a delight in a small workspace - as is being able to drop it down again and instantly have a dead square cut to the fence. Yes, you can do this with bench dogs and rail dogs, but it really isn't as convenient IMHO.
There's a couple of other tricks it can do - using the back of the rail as a guide for e.g. putting dominos for a centre shelf in a carcass is one of my most-used, and the long fence with flag stops makes this and other repeat actions very easy; plenty of clamping opportunities around the extrusion as well. All of which could be done by other means of course, but again, convenience.
That convenience comes at a price; I didn't pay anything like £500 for mine (bought second-hand and many years ago) and I'm pretty sure I wouldn't do so if it was lost/nicked/irreparably damaged; but it would be a tougher decision than you might think. Just saying...
Pete