The 'Pros' that helped me decide to host with DreamHost;
Unlimited host domains / sub-domains.
Unlimited MySQL databases.
Disk space and bandwidth increase weekly.
'Cons' that I've encountered since being a customer;
Web panel can be very slow at times.
Two web site outages (that I noticed), but both were resolved quickly.
Response from support can be a little slow at times, especially on weekends.
Some new accounts can take a few days to be approved.
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