Yes, it's good.
Some things to consider are:
1. It's a thicker core, so you'll need to do something about the clearance between the stock fan and the radiator.
2. You'll have to modify the stock fan shroud (i tried, but failed) to fit around the radiator.
3. If you go with the dual 11" fans (optional) that they offer, you'll need to make some brackets to mount the radiator. This kit has a HD relay for each fan along with temp switches. The electrical kit for the fans is from Painless Wiring. It is complete & first rate.
4. The dual fans make a very tight fit between the fans & the water pump.
5. Before you buy, make sure the heater outlet is in the right location. Usually they mount it for the std. S10/S15 so you'll run into clearance problems.
6. On trucks w/ ATR headers, the lower radiator hose rests on the x-over. You'll need to modify the hose (splice a short metal section into the hose at this point or use a metal corrigated hose) or it WILL fail. This could be a problem w/ the stock x-over also.
That's all I can think of right now.
Actual performance:
When I ran the truck last, using FAST for the fan control & 160 degree thermostat, the temp wouldn't very more than 10 degrees. This was in May w/ about 75-80 degree temps outside.