Quality of Sony SACD players as CD transports

To those who've used high quality redbook CD transports:

What do you think of the Sony SACD players as redbook transports going into an external DAC? I am thinking about the SCD-1, XA777ES and DVP-9000SE models.

Are these units, used for their digital out, in the same league as $3000-4000 transports like, say, the Levinson 37?

Thanks for the comments.