yea i have a wired ryobi which works well and has a really nice/secure latch for blades, and recently got a cordless HF one (blue one) and it's strong and working fine (19v one). the HF has a much cheaper/simpler system of holding blades, nowhere near as sturdy but they only fall out if you're not pressing down ont eh blades.
if you're gonna do any kind of metalwork, you need at least a grinder, a close 2nd is a sawzall ('reciprocating saw') and if you're working with any tubing like me, a cutoff saw is a must. i got mine for $30 at HF, it uses i think 6" grinder disks and has different angle settings. something that takes 3 mins with a grinder and 2 mins with a sawzall takes maybe 10 secs with the cutoff saw. and they last way longer than grinder disks.