This seems to come up quite a lot, so here's my tuppence once again...
I've got two tour hazers.
One PeaSoup Phantom.
One Le Maitre G300
Two (very broken) Le Maitre Neutron Star Hazers
Various Le Maitre smoke machines.
I've also regularly used DF-50's, Unique (as Norty said, it's a TH in a different case), Martin/Jem and various others in venues ranging from small clubs, conference centres to outdoor festival stages and Arenas.
I can positively recommend the PeaSoup for all of the above if you get the variable flow version.
It quite simply produces the best haze I've worked with.
The DF-50 gives a nice haze, but it's quite thick until you spread it about and can leave a nasty residue inside your equipment which is a pain to clean out.
The TourHazers are very nice for the money and pretty robust. I happily dry hire these and have only had one failure of a heat exchanger in over 4 or 5 years... however, getting spare parts can be a pain here... no idea what it's like over there... but I think TNB may be stocking them nowadays... but check with them rather than take my word as I could be mistaken!
My only complaint with the Phantom is the CO2 costs... it makes it a slightly more expensive machine to run, and also I won't dry hire it to just anyone... only someone I know and can trust to be careful with the cylinders...
The Le Maitre hazer produce a good haze, but the neutron range die without warning whenever they feel like it and are expensive (in time especially) to repair.
The new MRS hazer is very nice, but the couple I've seen had some annoying design flaws (which may now have been fixed...LeM assured me they were looking into it when I spoke to them a while back) such as not storing the dmx address when powered off and developing a nasty rattle if handheld slightly roughly...
The Unique is pretty nice, as it's basically the same machine internally as the tour hazer, however I've had many Uniques develop problems during shows... something my tour hazers haven't done, which puts me off them. This may be down to maintenance issues with the companies that supplied them, but as it's more than one company, that would be quite unlikely...
So basically, for me anyway, it boils down to the TourHazer or the Phantom...
Personally, having run both side by side, I'm definitely happy I paid the extra!
Especially for lasers... something about the ultra fine haze makes the beams look just that little bit nicer to me...
TourHazers are great, you just have to decide if you want to pay the extra for the excellence of the Phantom...