I learnt on a Gazelle and then transferred to Jabs for my HP endo
Flying a Gazelle is fun, they are responsive and forgiving.
The things that you need to be aware of is that it is a lot slower than a Jab, typically 75-85 knots cruise, slows down real quick and can handle a crosswind better
Fast, it aint, fun, it is
Everyone should fly a Gazelle at least once