I'm waiting for the Dex 4.20 to be able to: peek & poke plus retail pkg installs. If I get this right only Dex 3.55 is able to do that so far.
And if you convert your retail ps3 to 4.11 Dex flash, you will be able to only have 4 games at a time and the games must be on USB but it runs all firmware games up to 4.11... all your old PSN games would work but your not able to install new one with pkg manager since it cant read retail pkg yet.
I think it's best to wait... When it's possible to play full retail backups on the internal HDD on a DEX firmware, then it would probably be worth the risk to flash for a non bricked dex ps3