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I use a Hewlett Packard DesignJet 510 at work. As we are a construction site it is mainly used for plotting a1 sized construction drawings. The unit is wired up to our wireless router so we are able to plot from a variety of portacabin offices. The plotter itself is fairly slim and it was no trouble finding a space to fit it in, despite having fairly cramped offices.
The plotter itself provides a good level of service. It can rattle off a colour a1 draft quality line drawing in a couple of minutes, up to ten minutes on a better quality setting, automatically cutting it off the paper roll when it is done and dropping it into a holding receptacle. Line quality is good, with definition maintained on even the thinnest lines, though it struggles sometimes with blocks of colour. I have not yet overloaded the internal memory, though this is conceivably a problem if you are plotting detailed colour images.
The dye cartridges and paper rolls seem to last a long time, though we are relatively light users, and we have never struggled to find replacements. The unit has never broken or required servicing and continues to function well 14 months after it was installed. The user interface I add very straightforward and easy to master and it seems to have no problems communicating with our windows based PCs. I could see this model being a handy on-site plotter or possibly an entry level unit for a small design office.