The HF unit is garbage - so are most of the other cheapies - mostly due to lack of filtration and uber cheap pumps that fail if you look at them cross-eyed. With automotive or motorcycle parts you will quickly foul your (alarmingly expensive for the good stuff) solvent.
For an inexpensive unit - check out the safety-kleen offerings. I see their units go for the $100 to $200 range on craigslist. They are a step up from the Chinese stuff but still lack good filtration and decent pumps, etc.
If you want a quality unit with good solvent you will have to drop some serious coin. The solvent I use at my auto repair shop is $800 for 30 gallons. And of course its in a $1200 parts washer with excellent filtration and a lifetime warranty and free servicing (cleaning, sludge disposal, fluid change, parts replacement, etc) - all I have to do is buy solvent, filters, and use it as much as I like.
GD