The regular Addi TURBO circulars come in two flavors - regular tip and lace tip. The regular tips are just sharp enough for us, the majority of the knitting we do works really well with this tip, and the finish is just right for anything from silk to merino wool.
Addi Lace needles are a tad sharper - we use them for projects that need extra precision - detailed lace patterns, yarns that have a lot of loft and so you need extra precision when you're knitting. Some people just use the lace overall - I use them almost all the time - those extra tips help when your eyes are not so great!
Addi CLICKS are some of our favorite products - we've tried them all - and love them all. There are a couple of options with the CLICK Interchangeable - here is the scoop from our testing.
ADDI CLICK Turbo Interchangeables are the regular turbo tips, with 3 cords and a connector, in a spiffy carrying case. These is a fantastic all around interchangeable set. When we travel, we take a set along.
Addi CLICK Bamboo are a beautiful alternative to the Metal Clicks. These are very nice bamboo tips, with a great point. If you love bamboo needles (as we do) these are a great addition. These are especially good for very slippery yarns, where you need a little extra traction - they are not as slick as the metal addis, though they do have a smooth, silky finish.
ADDI Lace CLICK interchangeable are a must have for us - we usually travel with the two sets, regular and lace tip. Addi LACE Clicks have a really nice tip, and for us, are the right length for any project requiring extra precision. We often switch back and forth during projects - using the lace tips for detail work, and the regular ADDI tips for ribbing, stockinette and garter. The work really does fly when you use these needles.
ADDI Long Tip Lace - These are a great new addition - put together at the request of many knitters who needed a longer tip for more intricate patternwork - but what people have told us is that it also relieves stress on your hands having the longer tip. In addition, if you do a LOT of lace, this set features the new Life Line Cords - these cords have a tiny split in them near the join at the tip. You thread a carry-along yarn or really thread in here to knit with - when you have finished your 400 stitch pattern row - you can check your work and make sure all the stitches have made it onto the life line - it will catch all the stitches and if you've made a mistake, you have them all on your lifeline so you can catch it early. A great feature!