Joomla is a phonetic spelling of the Swahili word “jumla” (meaning “all together”) and was officially launched with version 1.0 on September 16, 2005
I personally have used Joomla since around 2007 extensively.
I started out installing and developing Mambo in 2003, I had well over 150 websites using Mambo by 2005, but by 2008 I had migrated all of these to Joomla which was a fork of Mambo, as I had foreseen the sad demise of Mambo. Indeed many of the developers of Mambo had already moved over to Joomla.
Joomla is used now worldwide by over two and a half million websites. Why would that not give you a positive image of the CMS? It’s totally dynamic in it’s use. From themes to plugins, everything is changeable and malleable, yet the power of this CMS can still be left with the customer after it’s initial deployment so that the cost of use does not have to be prohibitive.
I personally do not develop themes, I leave that with website developers, but I do develop plugins for a variety of customers, all bespoke.