The older Owon PDS series, to which you are presumably referring, is clearly inferior to other low-cost scopes like the Rigol DS1052E. This is why the Rigol is so popular, because it was the first affordable scope that didn't suck (as much). Reports about the Owon PDS series are that it has a nasty passive LCD, cheap mechanical build quality and felt like a cheap toy in general. I haven't felt the need to examine one in person, but the SDS series is reported to be significantly better. I would either save the money for a better DSO or buy an analog scope for much less.