I have the Ova 8 25 foot poles,quality poles and well worth the money,had the SLX poles which are great but got fed up with the reglueing of clamps and spinning sections.
Still use an SLX 30 on some jobs and although it is 5 feet longer it feels a lot heavier than the Ova 8 25,but funny enough don't feel there's much difference in weight compared to my SLX 25.
What I do notice is that there is more of a flex when using extended and at an angle like doing windows above a conservatory roof from the side which is beneficial to me,
Because the sections are more of an oval shape but are not 100 percent oval there is more flex from the side rather than upright if that makes any sense.
All in all a brilliant pole and will buy another at a longer length,don't know if there is extensions like Gardiner do.