Express VI usage

Question

I know that express VI's are generally frowned upon here. My question is why?
Is it because people think that the programmer should be able to do (manually) what the express VI is doing?
Or is it because express VI's generally dont perform very well?
The reason I ask is because I know how to use the DAQ stuff, but I still use express VI's when I need to send a lot of data at once.
As an example... if I need to read or write single lines or ports I'll do it manually.
If I need to dump a 1K buffer onto a FIFO memory board, I'll use an express VI.
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Answer 1

Wayne,
While express VIs may be frowned upon here, they do have their uses, and meet their intended goals quite well.Theyre great for people trying to do relatively simple tasks which arent very process intensive, like taking some thermocouple data and writing it to a file. They can greatly speed up design and built time, which saves money as LV developer time can get very expensive. They also take off a good chunk of the learning curve for new users, while still giving more functionality than something like SignalExpress. 
For an experienced programmer, there absolutely can be more efficient and flexible solutions created, but there is also typically a higher development cost.  
This is a community of labview developers, so of course there will be some bias to the more rigorous, higher performance way of doing things. That being said, a huge number of people in industry use express VIs on a daily basis because of the simplicity they offer. 
Regards,
Kyle Mozdzyn
Applications Engineering
National Instruments
Regards,
Kyle M.
Applications Engineering
National Instruments