According to Richard Hill’s post on his DNA Testing Adviser web site:
“DNA Heritage ceased operations in April 2011 and transferred existing customer results to Family Tree DNA. FTDNA has now announced the conversion program.
The Y-DNA conversion to the basic 25-marker level is free. Existing DNA Heritage customers should click the link below and opt in.
Once the conversion is complete, you can order upgrades from FTDNA at discounted prices.“
I’ve only heard good things about FamilyTree DNA.