I've used a Spektrum DX6 for about 6 months and i would recommend it to anyone. The only niggley thing is the small delay when you switch on. For a few seconds it seems like your radios broke, but obviously it must be the receiver searching or setting itself. Apart from that it's a well built piece of kit and I've seen full sets selling on Ebay for around £70 ! A bargain espescially when it's 6 channel with a 10 model memory. Try and buy one without servos as the Three servos that come with it are for 'park flyers', mini servos. They have plenty of torque but are a bit fiddly. They would be ideal however if you are going to RC smaller Revell type model kits, you won't get better.
As i have mentioned on another Mayhem Forum, i also use my transmitter attached to a 12v 7amp Yuasa battery over my shoulder, taking the charging socket out of the back (which is by the way that no-one seems to mention is reverse polarity to Futaba, hiTec, Acoms, Sanwa ETC ) and threading the wire through the empty hole. Instead of 9.6v the display can show up to 13.5v ! I've lost 0.2 of a volt over 6 months, that's not bad is it?