I have experience with the DM91A and it is a good basic multimeter. It has good number of counts (9999), reasonable accuracy, well built and with decent selection of features. It has a good range for resistance (100MΩ), very reasonable capacitance meter up to 10000µF (the manual claims 100000µF, but in practice it is too slow). It has a 3V diode tester. Its voltage range starts in VDC. The frequency meter is reasonable.
A few annoyances: it beeps at every change of the switch and keypress. The arrangement of the rotary selector is a bit weird - it starts with NCV, then voltage detector and only at the third position it goes to Volts. The bandwidth is somewhat low (~3kHz) but it has VFC if needed.
The bad stuff: do not trust its CAT ratings. It shared the µA/mA input with V/Ω. The continuity buzzer is very slow.
Other features that are quite nice: the flashlight is handy, although not very powerful. The backlight is very nice. The NCV is also the best as its antenna is very well visible at the top of the meter and it is not too sensitive. The battery testers are really nice as well.