For the 12 ports that support 10/100 mbps with POE , it is good. Not sure what you are going to use the other 12 slow ports for ? it also is expensive.
My personal preference is to use multiple smaller switches spread out around the house. This reduces the amount of long cable runs. It also allows for single failures with out loss of all video. Also each POE switch is plugged in to a UPS.
The 802.3af may be ok for small simple cameras. But if you are using a PTZ camera that draws a lot of power i would go with the newer 802.3at
I've used a FS726TP V1H2 sporadically for two years (eBay score $40 with two GBICs) and it works well, but it is really noisy compared to my newer POE+ NETGEAR 16-Port GS418TPP or NETGEAR 8-Port GS510TP. If 8 ports is enough GS510TP are going for <$100 on eBay.