I have one and the Hedge Trimmer attachment.

It is excellent for producing a fine tilth in previously dug soil to
good depth and even better for mixing in Compost and Grit etc..

Typical I would take off the Turf stack it to produce Loam and turn the
top two spits over roughly with a spade then use it to break the spits up

It will not unless you wait ages despite the adverts claims dig into
hard packed soil it is to light and just jumps about
Also stones will jam the tines but that happens with every type of
machine, except grown up ones like I also have!

I have an acre of Garden and use it everywhere as it is great as a
powered Hoe for working the soil between plants and obviously if the
soil is reasonably loose can create good sized planting holes and dig in
composts as well

Her indoors uses it all the time on the veg plot its great for ridging spuds

I also have a Camon C8 (250cc 120KG) rear tined Rotavator which is
typical of what you can hire, I bought it on Ebay and I hope to get what
I paid for it back when it is time to sell it, which is my idea of a
bargain! I use this to break virgin ground first.

I would not dare use it like the Mantis between existing plants or at
least those I want to keep.
:-)

Roy Forster wrote:
I have seen an advert for the above item and wonder if anyone knows of it
and could give an opinion.

I want to convert some of my back garden (lawn) to a vegetable plot. Most of
the plot is quite stony.

Any comments would be appreciated.

Thanks

Roy