I added iguana tweaks to my infinity pack for single player just for fun. Problem is I already had made stone tools with tinkers. That's not bad but I used the configs from me4 and I got a stone pick that could mine obsidian super fast from leveling it up and getting redstone and leveled up extremely quickly 171 blocks each time per level. Slightly op cause just mining underground and I could repair it on the go with cobble.
I started a new "Infinity" world with Iguana's last night... I start with the beginner's chest and got a wooden axe (levels quicker than Flint, but you can't make it yourself), that after hollowing out a 3 block first level in my "Siamese" Natura Redwood (two trees spawned so close together they look like they're joined at the hip) that axe now has Diamond (1st up) and two haste (snd and 3rd up).
When I started mining my pick got 1 Haste then 1 Emerald and then another haste as well as up to "Copper" level.
Good fun! BtW, DW20 ver. 1.0.4 is available now (not recommended yet), with TConstruct updated... I'm looking forward to trying Iguana's there