I have quite a few domains with DreamHost now and have not experienced any problems.
Transferring domains into or out of DreamHost has been relatively trouble-free, with the only delays caused by the registrar on the other end of the transfer.
One thing worth mentioning is that you will only be able to transfer .com, .net, .org and .info TLDs to DreamHost. You can host other TLDs here, but you will be unable to use DreamHost as the registrar for them.
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