Hi....I am a supporter and 'liker' of LCD thermometers. You just have to make sure that when you buy it, it is reading brightly and clearly appears to be the temp (eg, seeing a bright green bar at 72 in a comfy room is good). Contrary to many posts, some can be very close to exact and they make a very good backup thermometer. To make you feel better, we actually use them in the Operating Room on patients. Small strips are applied to the patients forehead.
Of course, the key word in any good aquarium is 'backup'. I keep a floating thermometer in mine which is useless (yes...they are always stuck to the back wall behind a plant or filter intake). But, it's there if I need it. Personally, I like the Coralife digital thermometer..not bad for $9 bucks.
SH
PS...if your LCD reads 77 and you take a nuclear fission temp and it's 75, your fish won't die. Unless you have an EXTREMELY SENSITIVE species, our fish are a lot more resilient than you think. Have fun.