I just found out one of big cons on SmartVP, and I believe that engineers are working on CODEC*/platform with video. I discovered this after trying to adjust speed and play with speed setting, SmartVP don't have manual settings for video speed, only 512K or higher and set automatically.
I know Sorenson NtouchVP can go as slow as 128K UPLOAD** speed and will work but won't get crystal clear video however still can be achieved. They usually recommended 256K UPLOAD speed. What I just found out that SmartVP minimum UPLOAD speed is 512! That is not good thing for those with low end DSL or on DSL and at remote location. Some of you may have applied for but can't get them, its possible due to lack of UPLOAD speed. Must be at least 512K, I have 4 times of that speed anyway.
For VP-200, can 128K upload speed, the secret what? Just turn off the color on both ends, and you will get crystal clear black n white video chat. I tested it and it works! See? The more data being transmit, the slower the video will be. Other way to get crystal clear video on any VP, how? reduce the clutter in background or minimize variety of colors and yes positioning light is the key. Having bright windows in background will kill most of high quality video.
*CODEC is a program or application whatever you call that does the compression of an image/data of whatever, it can be audio, Video, etc. Its like old application called PKZIP. If you take a picture and it end up whopping 15MB, too large to attach on your E mail to send your friend so, using PKZip to zip it up (Compressing) and it can reduce to like maybe 3MB so you can send it to your friend faster that way. That is how video CODEC works, take video of you, then compressing them then transmit over the Internet, then when arrive another VP, they decompress them and show that snapshot of video so your friend can see you. This is reason why its important to have proper set up VP for best video quality.
**For those who are unaware that there are almost always two different speeds when it comes to networking. Its called Download and Upload speed. Most of the time upload speed is slower than download speed. Most of ISP won't admit that until you ask them, they don't advertise the upload speed. If they say wooot we have 2MBPS (2,000KBPS) speed. They mean 2MBPS download speed, but their upload may be somewhere in 500KBPS which will disqualify SmartVP installation. Mine is 20/2MBPS and I have seen 30 sometimes but upload most of the time stuck at 2MBPS. I am okay with it.
The only time you can get same speed on both ways is dedicated line like T1, T3, OCX3 etc and they aren't cheap, and only one Cable based ISP that I know offers same speed on both ways, called Green light cable 50/50 as standard. I think it is in North Carolina.
So, if you want SmartVP but can't due to speed, just be patience and wait as they are working on it and hopefully can decrease speed to 256K like Sorenson can, and I hopefully FCC will make Sorenson CODEC standard, who knows?
So, if you have low upload speed (At least 192K), then stick with Sorenson, forget Purple and I have no idea of Z VP cause I don't have them and have no interest in them.
Some of you may complain not fair hearing people no problem clear sounds. Well, two things are true.... They don't always get crystal clear sounds, yes some hearing people told me "Whats wrong with these Deaf people complaining about poor video, sometimes my cellphone have lousy sound quality and I pay for it but they got VP service for free", Secondly Video uses 3 to 5 times more resources than audio, meaning they (Video) demand more though the network than audio does.
I was hoping that Purple would add White pages on their SmartVP. I have used Yellowpage feature on it, very nice and yes it works BUT problem is, can't save the number on contact list. I think it has to do with system unable to read yellow page and discriminate what number is really the number, see if Purple engineer used their heads and allow their VI input that number so that customer's SmartVP recognize that as a number then offer if want save on contact list.
Plenty of room to improve for Purple. Hopefully they would continue despite of FCC ruling on June 10, 2013. Same goes with Sorenson.