It's adequate, but it's probably fairly expensive to do it that way. You may want to look around for a bulk supplier (i.e. someone that doesn't pack it in bags). These are the places that supply soils to the landscapers in your area, and should be in the pnone book under soils.

The one I use in SoCal is Hanson's A-1 Soils, and I take 33 gallon trash cans to fill myself, and get it at a cost of about $6 per trash can full (or $24 per half yard if I borrow a large pickup, which fills the whole bed of the pickup). Hanson's is in the San Diego area.

Kathy

yes, you would be much better buying a tonne (1 cubic metre)of topsoil. Here is the UK, it comes delivered in a builders bag but quality does vary. Most potting mixes are multi-purpose and just do not have the heft of a decent loam - OK for a season or so and, in pots, top dressing can keep it doing well enough but for raised beds, there will be sources of topsoil which professional landscapers will use, which will keep their structure, hold onto water and nutrients and provide better anchorage for roots. Of course, you can amend this with all sorts of humus snd mulches.