The original A7A266 (based on the ALi Magik1 chipset, A0 stepping), was a tad slow unless you were using the 133MHz FSB and PC2100 DDR SDRAM.
It is a very stable board, with a couple of minor quirks. You need to change the position of the jumper located on the end of the AGP Pro slot in order to use more than 2 DDR DIMMs; rev 1.03 and 1.04 of the board are missing the multiplier control dipswitches, and only rev 1.10 or above support AthlonXP processors.
Just make sure that you use the latest drivers, as the older AGP drivers had problems with ATi video cards.
The A7A266 was superceded by the A7A266-E, which is a much better board: significantly faster, multiplier dipswitches, support for the latest processors.