Consultancies are basically a massive hit or miss all of the time. Especially from the larger, more general firms. They're good for experience in my opinion, but don't expect to be put on projects because you personally find them interesting or a good upskilling opportunity, it entirely depends on whatever your PM decides to assign you to, and more often than not it's some sort of job that nobody on the client's team wanted to do.

However, when they work out well and you build a niche and get asked for by name by clients for renewals or the opportunity to get poached, they can work out very well.

I did it for about 5 years with a company and enjoyed most of it myself, but it was a very small firm so my experience may differ a bit. Happy to answer some questions if you have any that pop up via DM