There is no delay associated with the Refund Transfer and it may actually help you get your money faster, depending on your circumstances. The answer depends on whether or not you have a bank account.
UPDATE: If you are filing before February 15th your refund may be delayed due to PATH Act. Get info here.
Anticipated receipt of refund according to IRS website.
How does the Refund Transfer work?
Usually 1 to 2 days before a refund is scheduled to arrive, the IRS sends a pre-notification of the refund amount to TPG. The IRS does not deposit the money at this time, but it is only a notification that the refund is on its way. We set up the disbursement upon receiving that pre-notification so that the money reaches the taxpayer on the same day it would have if the money was deposited directly from the the IRS into the taxpayer’s bank account.