I've never owned or used a 29, but I've had a 150GTL for 3 or 4 months now. I paid only 20 bucks for it ($119.95, free shipping and -$100 mail-in rebate, whoohoo!)
I like it, it does 15 watts carrier and I've got it set for 90-95 percent modulation, so it swings up past 40 watts no problem. On low it does 3 watt carrier and swings up past 10 watts. FM also works great. I am using a Superstar DM452 hand mic with it, and everyone likes how it sounds.
The channel mod is easy, just remove a chip resistor. It does block TX on several Frequencies below 1 and above 40, but there is a second mod to defeat that. That involves putting the resistor you removed for 11 meters in an empty slot on the board. I have not done this myself, because there are plenty of channels for me.
The RX isn't the best. It is quite sensitive, but allows lots of noise through. The NB/ANL are ok as far as alternator whine and stuff, but alot of static comes through around town, like those awful LED traffic signals, and high voltage power lines and stuff like that.
The echo and talkback work, but I don't use them. The backlit faceplate is nice.
I've had it in my car for many weeks now, and it is doing fine.
For 20 bucks, it is GREAT! For 150 bucks, I'm not so sure. You could get a Magnum 257 for just a little more, and have alot more radio, IMO. I only bought it 'cos it was such a great deal.