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Never bought from them, I looked at their sight. Lots of converters to choose from. Make sure you know what you want before you buy. I have a YankSS3200 with a 3.73 gear. It’s perfect for my setup. I initially wanted the 3600, shop that did the install steered me away from that. I road course a couple of times a year, 3200 with the 3.73 gear has really no effect on the road course, converter doesn’t whine at all, I have a trans cooler, highest temp I’ve seen is 230 on a road course.
So, just be sure you buy what you want. If you want a car that blows tires off, or drag car, get a 4000 or 4400.
It doesn’t matter who you buy from, as long as they ship you the product and it’s not damaged.
RPM Transmissions http://www.rpmtransmissions.com is a real and highly respected site. However, I've never heard of RPMspeed. RPM transmissions is a really solid place if you want a converter.