I have a site often see internal erro 500 in my DH shared hosting,
so I dicided to try the PS.
It turns out PS needed around 1000Mb that is 100$/M for running my site smothly!
then i emailed the support to move back to my shared hosting,
but they said i have to drop my usage to 150Mb first,
i have no choice only to move my sites out to avoid they charging me 100$/M.
So i found a gridhosting plan at 20$/M somewhere else, moved all my sites out my dreamhost plan, it is much faster than my Dreamhost server.

but even after i moved all my sites out, my usage of memory is still around 250Mb, so they charged me 30$ for my PS plan and still dont let me move back to shared hosting.

also DH often disable your site without warning, which hurt both your taffic and the trust of your users to your site.

DH plan looks have more features than their rivals, but for a stable website, stay away from it!
Anhosting and midphase is even worse than DH.

Me: “I have one more question
because I need to make sure. Is there any charge if we ever wanted to
switch back to shared hosting?”

DH: Nope! There is no fee to transfer back. Before moving back, however, your usage must be within the limits of a normal “happy hosting” account (since this is what you will be transferred back to). It also would not hurt to give us as much advance notice as is humanly possible, since it can take a few weeks to migrate you back under the best conditions. I hope I was able to answer your question, please let me know if you have any others.