Anyone use room calibration software?

I know quite a few people rely on REW to measure a room to see what the room is doing with response to speaker placement. It is free and with the right tools, it can be manageable. I know because I use REW for anything that would cause room response changes. Honestly, REW is a good tool but for me I really like a program called Smaart. This is what sound engineers use when tuning a pa system. All measurements is done using pink noise in real time. 

What I find alot is many put a system in a room wither treated or not,  not knowing what is actually going on with the response. I have measured quite a few times with different speakers and with or without room treatment and variations is different especially anything below 200 hz. I had some Vandersteen 2ci in a small room and the bass was great and natural. I removed the 2ci and put my DIY Dayton speakers and also sounded good but what I notice when I put the Dayton speakers it great. I measured both speakers and the response is similar throughout the spectrum until about 8k, the 2ci started to roll off and the Dayton until 16k. The big difference was in the lower midbass at around 200hz or lower. This is the region where it get erratic. With the 2ci, at 118 hz the response was at 6db where as with the Dayton speakers there was a a huge null at that frequency about 22db but goes back up to reference level when it goes lower in bass response.  The 2ci did not do this maybe due to the bass couplers as stereo pairs. 

I guess the moral of thread was to explain that putting different speakers is going to change the context of the sound with different companies. When I  hear people mention that their is no bass or lack of, need to figure out what is the cause of it.