SGS supports HSPA+ ?

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Hello ,
I have a Samsung Galaxy S . My carrier never had a 3G network .. so ive never really felt what its like to use a smartphone to its full potential :P .
And just a week ago they introduced HSPA+ . Now i have a couple of questions , since this wireless technology is evolving too fast for me to catch up with :
- HSPA+ is 4g ? 3.5g ?
- Does my phone support it ? to my understandings , i can connect to it but not at full speeds (21Mbps)
- Is that good news for me ? i mean they skipped 3g and launched HSPA+ ? should i be happy with that ?

Excuse my noobness :P ,
Cheers !

Your speeds will depend on your network and possibly your data plan.

Different carriers use different "bands" for high-speed data and the SGS may or may not support your carrier's band. T-Mobile, for example, uses the "AWS" band, which is not the same that, for example, AT&T uses.

If your data plan doesn't allow access to the APN that supports HDPSA+ then you won't have access to those speeds, even if your phone has a compatible radio.

There is a lot of specs-manship and marketing hype about what is and what isn't 4G.

On my SGS4G I am seeing over 4 Mbps down and over 1.5 Mbps up with T-Mobile in the San Francisco Bay area. I've only tested one location (that has mediocre signal levels), so it may be better elsewhere.