I've got one of these platesetters and regularly print quality full colour work with a line screen of 133lpi. It is a good backup for our other machine and is excellent for quality budget leaflets and quality stationery work.
Few things to watch for are that all the rollers are in good condition and turn over when the machine is working or you'll get plate jams, or skewed plates and that the glass with the imaging laser is not marked or burned as this happens over time and can ruin solids and large screen areas. I recommend making a plate with nothing else on it but 100% coverage of a solid colour and examine the plate closely for marks.
Also the chemistry is not environmentally friendly, so has to be disposed of properly. Despite the recommendations in the manual, I change the chemistry every 2 weeks and not every 4 weeks. Incedentally the Mitsubishi Silver Master chemicals are exactly the same as Pressteks but a lot cheaper.
Plates can be scratched so careful handling and fitting to your press is required.
Use "runny" inks as stiff inks are not as good for these plates. I like K&E (formerly Fishburn).
It will not work with Vista so you have to either network a Mac or install it on a XP Pro machine.
As to its age, the motherboard will probably require a new CMOS battery which is like a watch battery and only costs a few pounds. This happened to me and the motherboard stopped working and the AB Dick engineer diagnosed a new motherboard was needed at a thousand UK pounds. I changed the battery first just to make sure and well saved a grand!
One more thing, don't sit your monitor on the machine or it will flicker. Wall mount it or put it on a separate stand.