Anyone Moved To InnoDB

Question for people who have moved to InnoDB: I wonder if it is worthwhile?

I don't care about ACID compliance, my only interest is in the row level locking which I do not get with large MYISAM tables which do table locking and clog up everything. I have a huge database that needs frequent updates, like 50,000 per hour. I also don't care about InnoDB's large size of indexes and such, I have lots of hard disk to throw at it.

My fear is with the backup of InnoDB tables, and the fact that it is not as simple to "fire up" the tables when I restart the database. MySQL manual suggests something like a query to "Warm up" the tables.

Any thoughts would be great, and if possible, any help with what settings you use. FYI, I am on a 4GB RAM machine with dual Core2Duo procs. When I tried the following in my.cnf for the InnoDB stuff ---

Code:
#skip-innodb
innodb_buffer_pool_size=1G
# Set the log file size to about 25% of the buffer pool size
innodb_log_file_size=250M
innodb_log_buffer_size=8M
innodb_data_file_path=/idbdata1:200M:autoextend
innodb_additional_mem_pool_size=20M
innodb_log_group_home_dir = /iblogs
innodb_log_files_in_group = 2
innodb_flush_log_at_trx_commit=1
innodb_lock_wait_timeout=10
--- the MySQLD wouldn't start! Question about the stuff in red: what're those paths for?

Do I need to create those paths?