After researching the tillers in this thread (and quite a few others) I ended up buying the Earthquake Model 31285. The main selling points for me were dual-direction tilling, the price, that there is a hiller/furrower designed to be used with it (also purchased) and the fact that it is manufactured in my home state. If I ever need something urgently (or am less than satisfied with their service) I can drive the 3 1/2 hours to their factory.
This tiller is light enough & compact enough for its primary purpose, which will be weeding between rows, and small bed prep. It has a small engine for a tiller (only 99 cc.) but because the tiller tines are hardened sheet metal wheels rather than thick bolo tines, it cuts through the soil surprisingly well.
It's really hard to get everything you want in
any machine without paying top dollar, so it came down to compromises.
What I like:
- dual direction tilling
- a quick-reverse lever, that can be used from the operator position regardless of tilling mode... handy for backing out of tight spaces
- light weight
- REALLY easy starting; it takes a very light pull, probably due to the small engine. Presumably low fuel usage as well, for the same reason.
- assembly was easy, didn't have to "read between the lines" anywhere
What I'm not find of:
- there is only one forward speed (and one reverse). I had to watch several videos of the tiller in operation to ensure I would be happy with that speed. Unfortunately, only one forward speed seems to be the default for similar tillers in this price range.
- the shift lever is located on the transmission, rather than in the operator position
- the shift lever has 4 settings; forward tine, reverse tine, drive wheels only, and neutral. With the engine off, the wheels are locked except in neutral. The shift lever is not clutched, so it can be difficult to move between different positions. Jiggling the wheels back & forth while shifting helps.
- the drive wheels. They are hard rubber (not inflatable) and do not turn independently... so easier to keep straight in the row, but harder to turn. The wheels are attached by a bolt threaded in the end of the axle, and locked to the axle by a heavy steel pin which runs through the axle, locking into a corresponding slot on the wheel. This is not the best mounting method that could have been used, and contributed to my first problem.
The soil in my home gardens was dry enough to till lightly, so I decided to turn under the tubs of dry leaves which DW had collected during her yard work. The tiller started on the first pull; it easily turned over the smaller of two plots (12' X 32') and I moved on to the larger plot (15' X 85'). After making a few passes, I noticed the tiller wasn't pulling itself forward as strongly. I cleaned off & adjusted the depth setting, and it improved well enough to make two more passes - at which point the right wheel fell off.

Apparently, I had not tightened that wheel bolt enough... and equally apparent, the locking pin & bolt had fallen out (and been tilled under) well before the wheel worked its way off the axle. Try as we might, neither DW nor I could find the missing parts.
I called Ardisam (the manufacturer) to replace the parts, and report the problem. The CS was very helpful, and reported that they were already considering adding a torque spec to the wheel mounting instruction (so others may have reported this issue). I suggested that they also add a lock washer (only a flat washer was included) to the axle bolt, which she agreed with & promised to pass that on to Engineering. The replacement parts are being sent at no charge.
I will add further comments when I have had a chance to till more deeply, and to use the counter-rotating function. Meanwhile, if anyone else purchases this tiller, I would advise adding a lock washer to the axle bolts, to keep the wheels from working loose.