That line trimmer is sold as Pope, Sanli, Aldi/Gardenline, Gardener's Choice, GMC, Parklander, and probably various other brands as well. I even have one myself, though it has no starter and is therefore useless. A starter costs $15, which is as much as a working example of that machine is worth - Aldi sold them for $70 retail. I think you'll find you can't buy a bump head for less than $25 on ebay, and it will be considerably more from a mower shop. At least some of the parts are available from a mower shop in Melbourne that also sells the trimmer, and some of the parts, on ebay.
The machine seems to run reasonably well, and at 25.4 cc, is capable of doing a convincing job. It has a full-crank, smooth-running engine which is probably a copy of some product with an actual brand - it is extremely similar to the Ryobi 25.4 cc full-crank engine, and also seems like the Echo 25.4 cc engine. The carburetor is unbranded but appears to be the same as a Walbro WY, and seems to do a good job. The straight-shaft version might be better than the usual bent-shaft version - I've only tried the bent-shaft. My main criticism of mine is that it seems to have been assembled with liberal applications of some thread-locking compound which over-achieves its purpose. Getting it apart without damaging the threads or fasteners is quite a challenge.
If you buy a bump-head for it, remember that usually bent shaft machines require right hand thread, straight shaft machines require left hand thread. (This difference is because the bevel gears in the straight shaft head reverse the direction of rotation.) However there are trimmers whose engines rotate backwards (clockwise if viewed along the axis of the output shaft). If you buy a second hand head, buy one with the correct thread or it will be of no use to you. Your trimmer has a right-hand thread where its bump-head screws on, but there is not a standard diameter.