My very first mic was an Optomus RD mic. I worked really well. but sence then i have bought better mics from shure,nady and other brands. the RD mic picked up what ever i was trying to record very well and it was warm sounding. the only thing about it was that i could not get as loud as my other mics. I'm not saying that RD mics are better than shure or nady or whatever, but some of them are good for the money. i resently used my RD mic on a project that i was working on. i have used all of my "good" mics on my drums and i still needed a room mic. so i use the RD. I was very pleased with the sound, but a condinser would have been better.
Bottom line: If you want to get "OK" sounds, spend your money on a radio shack mic. If you want to get a "great-terrific" sound, save your money and buy a better brand like Shure and so on.
ZEKE
"Relax, it's only for tonight!"