I've had pretty good luck so far with a couple Chrome brand sealed ones, reasonably priced and both are at least a couple years old now. There's only one down side to these sealed batteries that I've run across so far - they give no warning when they decide to crap out. They work fine, like brand new, right up to the minute they die. With the old lead acid type, you could tell they were getting old, they cranked slower. You had some warning that it was time to shop for a new one.
I've had 2 sealed batteries on other bikes die. They both quit while I was riding the bike. It started fine minutes earlier and then while riding down the road, the battery failed. When I came to a stop, I discovered this, the bike stalled. When the RPMs dropped down to idle and the alternator output dropped off, the bike died. Normally, a good battery would provide the needed voltage to keep the ignition going when the charging output is low. The crapped out sealed battery had no voltage to give, lol. In both cases, I was able to get the bike running with a jump and then nurse it home with the headlight turned off and by keeping the revs up so the ignition would run off the alternator produced voltage. I have since invested in a couple sets of motorcycle specific jumper cables and carry a set on every sealed battery equipped bike I have now.