I have one! And will probably get another. Have it facing SW so it's getting a ton of sun which it likes. Beautiful and fragrant purple blooms for most of the summer and into fall. I used the 10-10-10 miracle grow hose end sprayer 3-4 times spring into summer - once per month.
My in laws also have a bunch of them and said not to cut them back ever but disagree; their's is massive but it's also not as dense and very woody. I just wait to prune it till early spring when there's no more risk of frost and then basically cut it all the way down to the ground. It grows right back up almost 5-6 feet high throughout spring and summer. If you want blooms earlier you can maybe not trim as much but imo it needs to be trimmed. It just looks neater and much more dense when cut back too; basically treat them like my forsythia - if you don't trim those either they get very woody and sparse.
They attract all kinds of creatures - butterflies, hummingbird moths, bees and have even seen hummingbirds on them as well.
Thought I had a picture of them but looks like only of them in the background of the sunflower (taken mid-August after trimming down to the ground in late April):
I'm in New England zone 5a if that helps.