Who is your buddy ? I don't recall anyone whom I haven't helped with a damaged product.RD 1750.1
Buddy bought a 1500d and it broke and no help from sundown.
X2....I'm local as well and have seen Steve (RD owner) at 3 different competitions and have talked to him some....He's never done anything to make me think he's a jerk...In fact I've also met some of the people who sell his products and they are all cool guys.....I've heard several systems with RD subs and amps and have been very impressed with them....I'm also local to RD, and I will say this.
Both amps, as stated, are similar. Different parts, both are very high quality amplifiers.
The shady business practices has been told time and time again, and sobeit. If you check, the people who caused all of the problems are gone and no longer affiliated with RD. Steve is a great guy, and spends time on his customers and I've not had a single problem out of the man.
I've also talked to Jacob a few times on here, he seems to be a genuinely nice guy and, as stated, has great customer support. You will not be disappointed with either item.
I agree with you as far as efficiency....I actually had a conversation with Chris at dB-r.com and he said they have ran these amps at 9 volts and they still played.....That says a lot about how good they are....I know that my car is in dire need of a bigger alternator but my Sundown still works perfectly when it's being starved.....Can't speak on RD, but Saz-1500D is a very strong amp Significantly more effiecient than some others I have used. Support is A+.