The A-5 has always worked flawless except for a problem with the ratchet in the cyclone which was fixed with the ratchet. The accuracy however was never so great even with the boomstick and a decent paint/bore match(we use xball bronze at our field) so after hearing about the bolt i purchase it and instal in on my a-5, take it outside and shoot it. Wow, i had never seen the gun so accurate. I tested it out when my friend came over (had near to zero paintball experiance) and everyshot i aimed well at him hit him. when we sat down to relax after a few games ( the temperature was around -1 celcius) he was complaining about the accuracy of the 98 and i told him its a paintball gun and their not usualy very precise so i take the a-5, aim at a tree 20-30 feet away and 9/10 shots were on the tree (about 2-3 inch in diameter) much better than the 98 now.
keep in mind we were using whitebox paint i got free on boxing day when i bought a case of xball bronze.
Some say they have better air efficency but i couldnt care less since i get free fills at my field and i own a scuba fill station at home, however, the price and the performance increase are definatly worth it. simply makes me want to buy a second A-5.