I'm also on a DSLHeaven account (Webafrica IP - although I think all DSLHeaven accounts have Webafrica IPs), 4Mb Account.
Pros:
Virtually perfect in any scenario for me, in some cases even better than VB.
1) Can stream Youtube HD videos without any problems (could do this on VB as well but not 24/7).
2) NNTP runs full speed 24/7 (460-490Kb/s), SSL
3) Steam runs very good as well, although I found the download speed to be slightly inconsistent but managed to download Aliens vs Predator (the game) via Steam yesterday without any hiccups (was a 14.7GB download)
4) Speedtest.net results are consistent every single time, for example:
http://www.speedtest.net/result/1669249259.png
5) International gaming latencies were sub 200 for me last night playing AvP on international UK servers.
6) Torrents also run full line speed with this account
Cons:
1) Like Froot mentioned, local latency for me is a little bit higher than it was with VB, which is a little bit disappointing, but it's nothing major, can live with it.
2) HTTP downloads (especially Megaupload) is not as fast as it is on VB for me personally, but I suppose after 12am the speeds should pick up, but on average they're about 200-300 kb/s on most filesharing sites. Other HTTP downloads fly again full line speed, so there is some shaping on filesharing sites, but it's acceptable.
As you can see, my pros out weigh the cons by a considerable margin at this stage, but I'm highly impressed with this account. Anyone still on VB might want to test drive a DSLHeaven account as it really is heavenly (pun intended) to say the least