What I am picking up on are four things:
1. These units apparently have "geometry issues". In other words, the yoke on the back of their CRT has become twisted. This typically happens when a big screen is being MOVED incorrectly (set down too hard). For example, someone posted this and the blood drained out of my head:
"This thing is so big and heavy that once we got the box out of the truck, we decided the best way to get it into the house was to roll the box end over end."
I would assume that the stockers at Walmart and some of the other people here reporting "geometry issues" are equally ignorant of how big-screen CRTs are designed. The only way to correct this after the yoke has been shifted like that is to call a TV repairman to come out and re-align the 50kVA coil.
2. Many people here seem unaware that 720p is not designed to be displayed on any CRT-based device. A CRT is inherently an analog device, unlike LCD. A CRT's electron guns are sweeping from left to right, from top to bottom at a fixed frequency and this process simply cannot handle 720p very efficiently, regardless of vendor. LCDs are ideal for 720p. Plasma and DLP are hybrid analog/digital technologies that may or may not properly handle 720p, depending on how they are implemented. Of course the problem with LCDs is that they typically can't show black very well (because they are backlit) and the problem with Plasma is that they burn out after 50,000 hours ($6/hr to watch TV!) and DLP is still rather expensive.
3. Many people here have reported picture quality symptoms that could be attributable to poor RF (radio frequency) shielding and cheap component-video connectors. This seems all too typical of Chinese produced products.
4. The on-board software on this unit apparently does not let people channel-surf with some of the channels coming from the Over The Air (OTA) digital tuner and others being assigned to the Coaxial analog tuner. What's the point of a TV that does not let you channel-surf properly? Apparently Sanyo's customers are forced to enter OTA digital mode to view digital channels and enter Coaxial analog mode to view their standard CATV channels (sort of the way Microsoft thinks vs. the way Apple thinks). One solution would be to use an external digital tuner (perhaps from cable, satellite or USDTV.com), but the problems of (3) come about.
Thus, in the end, buying this TV is like lighting $300-$500 on fire. For $300-$500 less, you can get a 36" analog TV, probably made in the same Chinese factory. If you really want HD, there is an HDTV card for your PC (or an external HD-tuner) that costs $200 and there are LCD/DLP-based projectors for under $1000 now. In the end, consider that Social Security will be bankrupt soon and you must have 15 times your annual earnings saved before retirement or you will lose your freedom (or worse). Are you going to look back and remember the days when you were buying "wanna-be" Chinese HDTVs and blowing big bucks on expensive cables? If you can't afford a real (LCD-based) HDTV, stay analog and send $20 of the difference to your local food bank (before 11/24) and put that other $280-$480 into your Roth IRA (or toward opening one). I put this financial stuff in my post because this is apparently a Walmart-only product that appears to sacrifice quality for price, a hallmark of Walmart merchandise. If you are buying staples (clothing, consumables, etc..), it may be acceptable to sacrifice quality for price, but for big ticket items such as HDTVs, home appliances, furniture, sports equipment, auto parts, etc.. you will usually wind up losing in the end.