Yep, I am still using it. It does have the ability to connect to external hardware (& you can even route various parts of a patch to different outputs) but I haven’t used that capability much so I can’t speak to it.
My main stumbling block at the moment is the lack of documentation: you can get a lot out of Architect just by looking at the descriptions for each competent, but I’ve given up on using some of the more complex devices (such as the step sequencers, which have a mind-boggling number of possible inputs) until there’s a full manual. The developer says he’ll have one ready once Architect gets to v1.0, but it’s not clear when that’ll happen.
Having said that – most of the devices in Architect are straightforward and can be figured out without a manual. Also, the developer is very responsive by email and by the official forum on KVR, so it’s easy to get your questions answered. If you’re interested in it, I say go for it if you’re willing to deal with the learning curve – it’s very powerful and will only become more so over time.