Looking for peer review on a "simple" iRule

when HTTP_REQUEST { 
  Set the default target pool 
 set defaultTarget "TTSHE-SysD" 
  
 if {[HTTP::header exists "BETAFirm"]} { 
  Set $firm to the value of the header 
 set firm [HTTP::header "BETAFirm"] 
 log local0.info "Set Firm to $firm" 
  Set $target to the pool name from the lookup table 
 set pair [class search -name SysPools starts_with $firm] 
 log local0.info "Returned '$pair' pair from search" 
 set target [getfield $pair " " 2] 
 log local0.info "Set Target to '$target' from table" 
  check for a mismatch resulting in a blank pool name and set to default if blank 
 if { $target eq "" }{ 
 log local0.info "Setting Target to default $defaultTarget" 
 set target $::defaultTarget 
 } 
  Forward request to the set pool 
 log local0.info "Forwarding request to pool $target" 
 pool $target 
 } else { 
  No Header found...send to default pool 
 log local0.info "No Header...Forwarding to default pool $defaultTarget" 
 pool $defaultTarget 
 } 
 }