hello fern, welcome and +1 to karcey's post... most will suggest play it before you buy it or at least play the same model. guitars don't all sound the same even if they are twins but thats bout as close as it gets buying used offline. in reference to the dread size, i have a slope shoulder design that is very comfortable... if i was going for an om i would check out the guild gad 30. fantastic guitars! martin om's are also nice but the all mahogany i played was too twangy for my taste.. soooo many to choose from! good luck!
