I have the 25 & 30 ft SL-X and much prefer the 30ft one.
The clamps are easier to open and close, (in fact, very easy to open one fingered). The clamps are very easily adjustable by hand with out the need for an allen key.
The only two faults I have at present are: the sections slide out too easily if you are trying to throw the pole straight out extending quickly. The old pole wouldn't allow the sections to come out easily as they were a very tight fit inside each other whereas this new (30ft), the sections don't stop until they've come out. The other fault (personal choice), is that there is only a small, narrow, red indicator band which isn't much good to me as I'm colour blind on red for starters and it's too narrow to see immediately whilst quickly extending pole. Should be yellow or at least a wider marker to give more visibility.
Prefer the fact that the pole is slightly shorter retracted but longer fully extended than the 25ft SL-X.