I had a ProLimit a few years ago. Nothing really bad, apart from the softish frontend; nothing really good either. I bought a Maui Sails 190-240 for slalom sails in 2006 and do not regret (of course!). Maui Sails carbon booms are probably the best booms available, and a totally safe choice. If one is going to spend money on a new carbon boom, I really can't imagine any possible reason not to choose a Maui Sails. Price is a bit higher, but the diference proves 100% worth.
By the way, the cost of a new ProLimit boom plus that of a Maui Sails front end will probably be more or less equal to that of a new Maui Sails boom.