The ones at Radio Shack (black with red handle) are ok. Not great, just ok. I paid $30 for it because I needed one fast and couldn't wait to order. Since you probably have the time to wait, try to find one online that has a locking pin to lock the handles closed. It sounds silly, but can make it much easier to fit the crimper in a small case.
The cutting blades on the Radio Shack crimper are poorly placed. They make it hard to srip the end without cutting into the wire.
Jason