It’s useful for DIY, but definitely not great. One has to carefully double-check everything; there’s no unit-tests to save your butt.

It can help out with understanding tools, workflows, materials, etc but doesn’t actually understands what it’s writing about and is prone to over-engineering, making critical mistakes or just replying with nonsense (for example swapping dimensions, recommending a completely inappropriate procedure, the wrong tool, etc).

This is all with Opus and Sol. Paying 22€ per month for that is a bit pricy for what one gets in return.